Aer Travel Pack 4 28L vs Tortuga Expandable Backpack
The Aer Travel Pack 4 28L is 28L and 1.6kg3.5lb; the Tortuga Expandable Backpack is 27L and 1.6kg3.5lb. They weigh the same. The Aer Travel Pack 4 28L costs $11 less. The Aer Travel Pack 4 28L fits the carry-on limit of 36 of 36 major airlines and the Tortuga Expandable Backpack fits 36; under the seat, 0 and 0 of 26.
| Spec | Aer Travel Pack 4 28L | Tortuga Expandable Backpack |
|---|---|---|
| Price | $239Best | $250 |
| Volume | 28L | 27L |
| Expands to | n/a | 32.5L |
| Weight | 1.6kg3.5lb | 1.6kg3.5lb |
| Carry-on compliance | 100% | 100% |
| Personal-item compliance | 0% | 0% |
| Dimensions | 49×32×20cm19.5×12.5×8in | 49×32×18cm19.5×12.5×7in |
| Laptop | 16" | 16" |
| Bottle pockets | 2 | 1 |
| Compression straps | n/a | 0 |
| Opening | Clamshell, clamshell (lay-flat main compartment) | Panel access, front-loading |
| Warranty | Lifetime | Lifetime |
| Torso length | n/a | 43 to 48cm (17 to 19in) |
| Fit | n/a | Unisex |
| Organizer | Yes | Yes |
| Shoe compartment | No | No |
| Hydration sleeve | No | No |
| Frame sheet | Yes | No |
| Water-resistant | No | No |
| Rain cover | No | No |
| MOLLE | No | No |
| Hip belt | No | Removable |
| Sternum strap | No | Yes |
| Load lifters | Yes | Yes |
| Shoulder strap | No | No |
| Luggage pass-through | Yes | Yes |
| Camera compartment | No | No |
| Material | 1680D CORDURA ballistic nylon exterior (bluesign approved), ripstop nylon interior (bluesign approved), YKK zippers, Duraflex hardware | 630D CORDURA re/cor RN6 nylon |
| Last checked | 2026-09 | 2026-09 |
Where their airline fit differs
Both bags pass and fail the same airline size limits.
Add more bags to this comparison
Specs come from each brand's own product page. Fit uses listed dimensions in any orientation. How we score carry-on fit.