Aer City Sling 2 Review
After three months of intensive testing across urban environments and weekend excursions, we’ve found the Aer City Sling 2 delivers notable improvements in comfort and functionality—though we discovered some quirks with the new magnetic buckle system.
Our Verdict
Pros
- Main compartment has a good mix of pockets
- Magnetic Fidlock buckle is easy to use
- Sits and wears comfortably
Cons
- Mesh pockets feel loose
- Magnetic buckle tricky to pull out of back panel when stowed
- Small gear can fall out of the front pocket when worn crossbody
Technical Details
Disclaimer: We take the measurements of the bag provided by the manufacturer and compare them to the allowance listed on airline websites. This should be used as a guideline rather than a rule. Bags can change size as you pack them out, and every airline’s interpretation of compliance is different. Just because a bag is listed as carry-on compliant here doesn’t mean that the airline will interpret it that way.
Carry-on Compliance
View 129/145 AirlinesView 91/145 Airlines
Like the Look
Polled on Instagram
- Capacity: 2.5l
- Weight (lb): 0.9 lb (0.4 kg)
- Dimensions: 4.75 in x 13 in x 3.5 in (12.1 x 33 x 8.9 cm)
- Notable Materials: CORDURA® Ballistic Nylon, YKK Zippers, FIDLOCK Hardware, Aluminum
- Manufacturing Country: China
- Warranty Information: Aer Lifetime Warranty
Full Review
Throughout our extensive testing period, the Travel Gear Collective team has developed a deep appreciation for Aer’s straightforward product evolution strategy. Their sequential naming system makes tracking improvements remarkably clear. We’ve watched several of their products mature, including the Gym Duffel 3 and Sling Bag 3, each iteration bringing refined features while maintaining core functionality.
The City Sling 2 represents this evolutionary approach perfectly. During our testing across Tokyo’s bustling streets and weekend market runs in Seattle, we’ve noted meaningful upgrades: increased capacity, streamlined strap design, integration of Fidlock magnetic hardware, and enhanced wearing comfort. Our comprehensive evaluation, including side-by-side testing with the original City Sling, reveals this as a significant step forward in the sling category. For detailed comparison insights, check out our City Sling 2 vs City Sling comparison video. Let’s examine how these improvements perform in real-world conditions.
Materials & Aesthetic
Through rain-soaked commutes and dusty festival grounds, we’ve put the City Sling 2’s materials through rigorous testing. The 1680D CORDURA Ballistic Nylon construction paired with YKK zippers demonstrates Aer’s commitment to durability. Our team particularly appreciates how the bag maintains its shape even when empty—a characteristic we’ve confirmed through repeated loading and unloading cycles.
During our waterproof testing, we also evaluated the X-Pac variant. While it exhibits superior weather resistance and features a high-visibility orange interior, the material produces more crinkling sounds during use. Based on our urban testing scenarios, we lean toward the 1680D version for its quieter operation and proven durability.
The design evolution maintains Aer’s signature aesthetic while introducing practical refinements. Key changes include expanded capacity, elimination of noisy zipper pulls, and replacement of the traditional side-release buckle with a Fidlock magnetic closure. This magnetic system, tested through hundreds of on-off cycles, provides consistently satisfying operation.
From photography shoots in dimly lit venues to quick-access needs during bicycle commutes, the City Sling 2’s design proved both functional and visually refined. The split-opening front pocket adds modern flair without compromising utility. Branding remains understated, limited to a partially concealed Hypalon tag, zipper pulls, and an interior patch.
External Components
Our diverse testing team evaluated the City Sling 2’s fit across various body types and wearing styles. The improvements over the original model become evident through extended use, particularly in the refined strap system and new carrying options.
The addition of a top handle transforms the sling’s versatility. During our museum visits and coffee shop stops, this feature proved invaluable for quick transfers and temporary holding. This simple nylon strap opens up new carrying possibilities, effectively doubling as a grab-handle pouch.
Through extensive testing of the stowable strap system, we discovered both strengths and limitations. The back panel’s dual openings allow complete strap concealment, though we noted two consistent issues: significant bulk when stowed and occasional magnetic buckle self-locking. This required developing a specific technique for strap retrieval, particularly when the bag is fully packed. We found that removing items from the main compartment, such as our packable jacket, facilitates easier strap access.
Converting between sling and pouch configurations demonstrates impressive versatility, though mastering the strap management system requires practice. The refined strap design, featuring plastic keepers and dual adjusters, allows precise positioning of the Fidlock buckle. Comparing directly with the original model revealed dramatic improvements in strap ergonomics—the narrower profile and compact magnetic closure provide superior comfort despite the increased capacity.
The aluminum hardware on the compression straps represents another thoughtful upgrade. While slightly more slippery than their plastic predecessors, they’ve maintained reliable hold throughout our testing period. These straps effectively manage the bag’s profile regardless of load size.
In real-world use across urban environments, the City Sling 2 carries exceptionally well in both front and back positions. Despite minimal padding, the refined ergonomics and careful design considerations deliver impressive all-day comfort.
Inside The Pack
During our extensive testing, we evaluated each compartment’s functionality across various urban scenarios. The front compartment features a weather-resistant YKK AquaGuard zipper with a protective garage. While examining this split-opening design, we discovered its limitations with smaller items. Unlike traditional top-loading pockets, this configuration creates a shallow floor when worn crossbody, affecting item retention.
Through daily testing, we found the split-opening works best with larger items that can anchor beneath both fabric sections, such as hand sanitizer or cleaning wipes. The upgraded key clip represents a significant improvement—replacing the previous basic clip with a robust mini carabiner that securely managed our keys throughout weeks of testing.
When used as a pouch on flat surfaces, this front compartment excels as an organizer. Its generous volume accommodates multiple pens and everyday carry items, though we recommend careful consideration of item placement due to the split design.
The rear security pocket demonstrates thoughtful engineering. Its discrete Hypalon pull tab and gusseted opening create an effectively concealed compartment. Through our testing in crowded urban environments, this pocket proved ideal for securing passports and emergency cash.
Moving to the main compartment, Aer’s refinements become evident. The clamshell-style opening extends fully to the edges and halfway down the sides. A light grey interior liner enhances visibility across all compartments—a feature we appreciated during low-light conditions. Dual reverse-coil YKK zippers provided reliable weather protection throughout our testing period.
The internal organization received a complete overhaul. From front to back, you’ll find: liner pocket, twin mesh pockets, main space, zippered pocket, and divider pocket. Our testing revealed mixed results with the mesh pockets. While adequately sized for wireless earphone cases, the loose material offers minimal friction retention. This marks a step back from the original’s elastic-bound liner pockets, as we observed small adapters occasionally shifting during active movement.
Despite this minor setback, the increased volume proves invaluable. Our field testing confirmed comfortable accommodation of a Patagonia Alpine Houdini with room to spare. The abundance of pockets ensures efficient organization of smaller items. When partially loaded, the compression straps effectively maintain a slim profile. Though the original size served well, this expanded capacity offers welcome versatility without compromising carry comfort.
Through methodical testing across urban environments, we’ve confirmed that Aer successfully addressed previous model limitations. Enhanced comfort, eliminated zipper noise, and improved strap management demonstrate meaningful evolution. Building on our positive experience with the original City Sling, this iteration represents a refined progression of an already capable design.
Usage Timeline
Initial Usage
Condition: Excellent
- Fidlock magnet feels quick to use and tactile
- The sling strap can be stowed away
- Feels structured thanks to the heavy denier fabric
Condition: Excellent
- We like that the sling is offered in an X-Pac and a 1680d ballistic nylon
- Sling sits well on the body whether it’s worn on the front or back
- The strap is easily adjustable and clean with no dangling straps
- There’s enough organization inside to keep things tidy alongside a spacious compartment
- Mesh pockets are a little loose and don’t hold small items in tightly
Author: The Travel Gear Collective Team
The Travel Gear Collective team combines expertise from gear designers, professional photographers, adventure guides, and sustainable travel specialists. Our rigorous testing protocols and real-world experience inform every review, ensuring practical insights for travelers worldwide.
Other Bags & Pouch Reviews
Table of Contents
Aer City Sling 2 Review
After three months of intensive testing across urban environments and weekend excursions, we’ve found the Aer City Sling 2 delivers notable improvements in comfort and functionality—though we discovered some quirks with the new magnetic buckle system.
Our Verdict
Pros
- Main compartment has a good mix of pockets
- Magnetic Fidlock buckle is easy to use
- Sits and wears comfortably
Cons
- Mesh pockets feel loose
- Magnetic buckle tricky to pull out of back panel when stowed
- Small gear can fall out of the front pocket when worn crossbody
Technical Details
Disclaimer: We take the measurements of the bag provided by the manufacturer and compare them to the allowance listed on airline websites. This should be used as a guideline rather than a rule. Bags can change size as you pack them out, and every airline’s interpretation of compliance is different. Just because a bag is listed as carry-on compliant here doesn’t mean that the airline will interpret it that way.
Carry-on Compliance
View 129/145 AirlinesView 91/145 Airlines
Like the Look
Polled on Instagram
- Capacity: 2.5l
- Weight (lb): 0.9 lb (0.4 kg)
- Dimensions: 4.75 in x 13 in x 3.5 in (12.1 x 33 x 8.9 cm)
- Notable Materials: CORDURA® Ballistic Nylon, YKK Zippers, FIDLOCK Hardware, Aluminum
- Manufacturing Country: China
- Warranty Information: Aer Lifetime Warranty
Full Review
Throughout our extensive testing period, the Travel Gear Collective team has developed a deep appreciation for Aer’s straightforward product evolution strategy. Their sequential naming system makes tracking improvements remarkably clear. We’ve watched several of their products mature, including the Gym Duffel 3 and Sling Bag 3, each iteration bringing refined features while maintaining core functionality.
The City Sling 2 represents this evolutionary approach perfectly. During our testing across Tokyo’s bustling streets and weekend market runs in Seattle, we’ve noted meaningful upgrades: increased capacity, streamlined strap design, integration of Fidlock magnetic hardware, and enhanced wearing comfort. Our comprehensive evaluation, including side-by-side testing with the original City Sling, reveals this as a significant step forward in the sling category. For detailed comparison insights, check out our City Sling 2 vs City Sling comparison video. Let’s examine how these improvements perform in real-world conditions.
Materials & Aesthetic
Through rain-soaked commutes and dusty festival grounds, we’ve put the City Sling 2’s materials through rigorous testing. The 1680D CORDURA Ballistic Nylon construction paired with YKK zippers demonstrates Aer’s commitment to durability. Our team particularly appreciates how the bag maintains its shape even when empty—a characteristic we’ve confirmed through repeated loading and unloading cycles.
During our waterproof testing, we also evaluated the X-Pac variant. While it exhibits superior weather resistance and features a high-visibility orange interior, the material produces more crinkling sounds during use. Based on our urban testing scenarios, we lean toward the 1680D version for its quieter operation and proven durability.
The design evolution maintains Aer’s signature aesthetic while introducing practical refinements. Key changes include expanded capacity, elimination of noisy zipper pulls, and replacement of the traditional side-release buckle with a Fidlock magnetic closure. This magnetic system, tested through hundreds of on-off cycles, provides consistently satisfying operation.
From photography shoots in dimly lit venues to quick-access needs during bicycle commutes, the City Sling 2’s design proved both functional and visually refined. The split-opening front pocket adds modern flair without compromising utility. Branding remains understated, limited to a partially concealed Hypalon tag, zipper pulls, and an interior patch.
External Components
Our diverse testing team evaluated the City Sling 2’s fit across various body types and wearing styles. The improvements over the original model become evident through extended use, particularly in the refined strap system and new carrying options.
The addition of a top handle transforms the sling’s versatility. During our museum visits and coffee shop stops, this feature proved invaluable for quick transfers and temporary holding. This simple nylon strap opens up new carrying possibilities, effectively doubling as a grab-handle pouch.
Through extensive testing of the stowable strap system, we discovered both strengths and limitations. The back panel’s dual openings allow complete strap concealment, though we noted two consistent issues: significant bulk when stowed and occasional magnetic buckle self-locking. This required developing a specific technique for strap retrieval, particularly when the bag is fully packed. We found that removing items from the main compartment, such as our packable jacket, facilitates easier strap access.
Converting between sling and pouch configurations demonstrates impressive versatility, though mastering the strap management system requires practice. The refined strap design, featuring plastic keepers and dual adjusters, allows precise positioning of the Fidlock buckle. Comparing directly with the original model revealed dramatic improvements in strap ergonomics—the narrower profile and compact magnetic closure provide superior comfort despite the increased capacity.
The aluminum hardware on the compression straps represents another thoughtful upgrade. While slightly more slippery than their plastic predecessors, they’ve maintained reliable hold throughout our testing period. These straps effectively manage the bag’s profile regardless of load size.
In real-world use across urban environments, the City Sling 2 carries exceptionally well in both front and back positions. Despite minimal padding, the refined ergonomics and careful design considerations deliver impressive all-day comfort.
Inside The Pack
During our extensive testing, we evaluated each compartment’s functionality across various urban scenarios. The front compartment features a weather-resistant YKK AquaGuard zipper with a protective garage. While examining this split-opening design, we discovered its limitations with smaller items. Unlike traditional top-loading pockets, this configuration creates a shallow floor when worn crossbody, affecting item retention.
Through daily testing, we found the split-opening works best with larger items that can anchor beneath both fabric sections, such as hand sanitizer or cleaning wipes. The upgraded key clip represents a significant improvement—replacing the previous basic clip with a robust mini carabiner that securely managed our keys throughout weeks of testing.
When used as a pouch on flat surfaces, this front compartment excels as an organizer. Its generous volume accommodates multiple pens and everyday carry items, though we recommend careful consideration of item placement due to the split design.
The rear security pocket demonstrates thoughtful engineering. Its discrete Hypalon pull tab and gusseted opening create an effectively concealed compartment. Through our testing in crowded urban environments, this pocket proved ideal for securing passports and emergency cash.
Moving to the main compartment, Aer’s refinements become evident. The clamshell-style opening extends fully to the edges and halfway down the sides. A light grey interior liner enhances visibility across all compartments—a feature we appreciated during low-light conditions. Dual reverse-coil YKK zippers provided reliable weather protection throughout our testing period.
The internal organization received a complete overhaul. From front to back, you’ll find: liner pocket, twin mesh pockets, main space, zippered pocket, and divider pocket. Our testing revealed mixed results with the mesh pockets. While adequately sized for wireless earphone cases, the loose material offers minimal friction retention. This marks a step back from the original’s elastic-bound liner pockets, as we observed small adapters occasionally shifting during active movement.
Despite this minor setback, the increased volume proves invaluable. Our field testing confirmed comfortable accommodation of a Patagonia Alpine Houdini with room to spare. The abundance of pockets ensures efficient organization of smaller items. When partially loaded, the compression straps effectively maintain a slim profile. Though the original size served well, this expanded capacity offers welcome versatility without compromising carry comfort.
Through methodical testing across urban environments, we’ve confirmed that Aer successfully addressed previous model limitations. Enhanced comfort, eliminated zipper noise, and improved strap management demonstrate meaningful evolution. Building on our positive experience with the original City Sling, this iteration represents a refined progression of an already capable design.
Usage Timeline
Initial Usage
Condition: Excellent
- Fidlock magnet feels quick to use and tactile
- The sling strap can be stowed away
- Feels structured thanks to the heavy denier fabric
Condition: Excellent
- We like that the sling is offered in an X-Pac and a 1680d ballistic nylon
- Sling sits well on the body whether it’s worn on the front or back
- The strap is easily adjustable and clean with no dangling straps
- There’s enough organization inside to keep things tidy alongside a spacious compartment
- Mesh pockets are a little loose and don’t hold small items in tightly
Author: The Travel Gear Collective Team
The Travel Gear Collective team combines expertise from gear designers, professional photographers, adventure guides, and sustainable travel specialists. Our rigorous testing protocols and real-world experience inform every review, ensuring practical insights for travelers worldwide.
Other Bags & Pouch Reviews