Aer City Pack Pro 2 vs Travel Pack 3 Small: Which Travel Backpack Fits Your Trip?

Introduction

Aer has built a reputation on travel backpacks that balance a clean look with genuinely practical organization, and the City Pack Pro 2 and the Travel Pack 3 Small are two of the most interesting options in the current lineup. The City Pack Pro 2 is marketed as a daypack, but in practice it works surprisingly well as a personal item travel pack. The Travel Pack 3 Small is the compact version of Aer’s popular travel backpack, offering a bit more capacity at the cost of a slightly larger footprint.

This comparison looks at how the two bags differ in size, materials, organization, and carry comfort, so you can pick the one that matches how you actually travel.

Sizing: Personal Item Dimensions Compared

The City Pack Pro 2 measures roughly 18 by 12.5 by 7 inches, which is close to ideal for a personal item bag. It fits easily into a common 18 by 14 by 8 inch personal item sizer box used by many US budget airlines, as long as it is not overpacked. The Travel Pack 3 Small, at about 19 by 13 inches, is only slightly larger in volume but just a little too long to fit comfortably in that same sizer.

If flying with budget carriers is a regular part of your travel routine, that small difference in dimensions matters more than the capacity gap. The City Pack Pro 2 is listed at 24 L, while the Travel Pack 3 Small comes in at 28 L. The City Pack also has fewer pockets eating into its internal space, so its usable capacity sits close to the listed figure.

External Organization and Materials

Aer gives the City Pack Pro 2 a decent amount of external organization: the signature front slash pocket, two more top pockets for small gear, two side water bottle pockets, an external laptop compartment on the back, and a luggage pass-through sleeve. The two largest front pockets are separate from the main compartment, so they carry their own volume without competing with the space inside.

The side water bottle pockets lay flat when unused but stretch out noticeably thanks to a small accordion fabric flap. They hold smaller bottles snugly and still expand enough for fat one-liter bottles. A small clip point near the pockets is handy for securing gear in transit so nothing topples out when the bag is jostled in an overhead bin.

On materials, Aer now offers most of its bags and pouches in three fabric options. The City Pack Pro 2 in this configuration uses 1680 Cordura, which is the most durable, flexible, and softest option, though it is the least waterproof and does not come with waterproof zippers. If water resistance matters more, the X-Pac and Ultra fabrics use waterproof fabrics with water-resistant zippers, with Ultra being the lightest but more expensive choice.

Carry Comfort and Harness Design

For a 24 L pack, the carry system on the City Pack Pro 2 is about as good as it gets. The shoulder straps are thick and well padded with a wide profile, good mesh backing, an easily adjustable sternum strap, and strap keepers so nothing dangles. The back panel is thick and soft with a ventilation strip down the middle, and there is a luggage pass-through sleeve for pairing with rolling luggage.

The Travel Pack 3 Small carries a bit more weight on the harness side. Its straps are thicker and wider, and it adds top load adjusters and hip belt loops, which are useful when carrying heavier loads but arguably unnecessary on a pack this small. Both bags feature thick, padded webbing top and side carry handles; on the City Pack Pro 2 they sit slightly offset, which makes briefcase mode a little slanted but gives the bag a distinctive, characterful look.

Laptop Protection

Both bags treat tech protection seriously. The City Pack Pro 2 has a dedicated laptop compartment with top access, an AquaGuard zipper with double pulls, and lockable zippers. Inside sits a simple but well-padded sleeve that holds up to a 16-inch laptop, kept away from the sides of the bag with a decent false bottom to protect against drops. There is also an additional unpadded front sleeve with its own large false bottom, suitable for a notebook, e-reader, or second tablet.

Interior Design and Packing

The standout feature of the City Pack Pro 2 as a travel bag is its complete front-opening zipper that opens into a large lay-flat main compartment. Leave it partly zipped and fold it down to pack from the top like an everyday carry, or unzip it fully for suitcase-style packing. There is additional small gear organization inside, including a thin fabric sleeve at the bottom and a stretchy-lined zipper pocket at the top.

For packing, smaller, narrower packing cubes work best in a bag this size. A single medium cube fits with room on top for a toiletry kit, while two smaller cubes sit side by side with just enough space above for a small pouch. Compression cubes also fit and leave a bit more room along one side for a jacket or soft items. Fully packed out, the bag holds a realistic travel load without ballooning past its personal item dimensions.

Which One Should You Buy?

The choice comes down to how you fly. If you rely on budget airlines and want a bag that reliably fits the personal item sizer, the City Pack Pro 2 is the safer pick. Its lay-flat opening, near-accurate 24 L capacity, and excellent carry comfort make it a genuinely capable travel bag despite being sold as a daypack.

If you want a few extra liters of space, a heavier-duty harness with hip belt loops, and you mostly fly carriers with more generous size limits, the Travel Pack 3 Small makes more sense. Just be aware it sits slightly too long for the most common personal item sizer.

Conclusion

Both bags deliver the clean design and practical organization Aer is known for, but they serve different travelers. The City Pack Pro 2 is the personal item specialist: slimmer, lighter, less expensive, and easier to fly with. The Travel Pack 3 Small trades a little of that portability for extra capacity and a more robust carry system. Matching the bag to your typical airline and packing style is what will make either one a good purchase.