Tortuga Packable Backpack vs. STM Prime
Two carry-on travel backpacks, compared spec for spec.
Tortuga Packable Backpack
| Capacity | 19 L |
| Weight | 0.3 kg |
| Dimensions | 46×26×16 cm |
| Airline fit | 95% |
| Price | $80 |
Feature by feature
| Tortuga Packable Backpack | Feature | STM Prime |
|---|---|---|
| Storage | ||
| N | Compression | N |
| None | Expanded Capacity | None |
| 0 | Opening | 0 |
| top | Passport | top |
| N | Passthrough | N |
| Carry | ||
| Y | Backpack | Y |
| N | Hip Belt | N |
| removable | Sternum Strap | Y |
| Inside | ||
| N | Laptop | 13in |
| 2 | Main Compartments | 2 |
| N | Organizer | N |
| Outside | ||
| × | Hard Shell | × |
| N | Rain-fly | N |
| 2, side | Water Bottle Holder | 2, side |
| N | Water Resistant | Y |
| Material | |
| 70D ripstop nylon | Polyester |
STM Prime
| Capacity | 15 L |
| Weight | 0.7 kg |
| Dimensions | 42×26×13 cm |
| Airline fit | 96% |
| Price | $80 |
Key differences between the Tortuga Packable Backpack and STM Prime
- Sternum strap: Removable on the Tortuga Packable Backpack; Yes on the STM Prime.
- Laptop sleeve: No on the Tortuga Packable Backpack; 13in on the STM Prime.
- Water resistant: No on the Tortuga Packable Backpack; Yes on the STM Prime.
Both have: passport pocket, backpack straps, water bottle pockets.
Which airlines take each bag as a carry-on
We checked both bags against the carry-on size limits of 189 airlines. 179 accept both. 0 accept only the Tortuga Packable Backpack, and 2 accept only the STM Prime.
Only the STM Prime fits
Air Tahiti, Gulf Air.
Tortuga Packable Backpack vs. STM Prime: which should you pack?
The Tortuga Packable Backpack carries 4L more than the STM Prime (19L vs. 15L), while the Tortuga Packable Backpack is the lighter pack at 0.3kg (vs. 0.7kg). For carry-on flexibility, the STM Prime fits 96% of the airlines we track — the higher of the two. If you prioritise packing volume, choose the Tortuga Packable Backpack; if you want to travel lighter, the Tortuga Packable Backpack is the better call.