STM Prime vs. Alpine Sea Cove Bag 11L
Two carry-on travel backpacks, compared spec for spec.
STM Prime
| Capacity | 15 L |
| Weight | 0.7 kg |
| Dimensions | 42×26×13 cm |
| Airline fit | 96% |
| Price | $80 |
Feature by feature
| STM Prime | Feature | Alpine Sea Cove Bag 11L |
|---|---|---|
| Storage | ||
| N | Compression | N |
| None | Expanded Capacity | None |
| 0 | Opening | 0 |
| top | Passport | side |
| N | Passthrough | N |
| Carry | ||
| Y | Backpack | N |
| N | Hip Belt | N |
| Y | Sternum Strap | N |
| Inside | ||
| 13in | Laptop | N |
| 2 | Main Compartments | 2 |
| N | Organizer | N |
| Outside | ||
| × | Hard Shell | × |
| N | Rain-fly | N |
| 2, side | Water Bottle Holder | 1, front |
| Y | Water Resistant | Y |
| Material | |
| Polyester | ULTRA GRID Environmentally Friendly // PFC Free C0 DWR Face - 1500mm PU Backing |
Alpine Sea Cove Bag 11L
| Capacity | 11 L |
| Weight | 0.5 kg |
| Dimensions | 40×20×12 cm |
| Airline fit | 99% |
| Price | $95 |
Key differences between the STM Prime and Alpine Sea Cove Bag 11L
- Passport pocket: Top on the STM Prime; Side on the Alpine Sea Cove Bag 11L.
- Backpack straps: Yes on the STM Prime; No on the Alpine Sea Cove Bag 11L.
- Sternum strap: Yes on the STM Prime; No on the Alpine Sea Cove Bag 11L.
- Laptop sleeve: 13in on the STM Prime; No on the Alpine Sea Cove Bag 11L.
- Water bottle pockets: 2, side on the STM Prime; 1, front on the Alpine Sea Cove Bag 11L.
Both have: water resistant.
Which airlines take each bag as a carry-on
We checked both bags against the carry-on size limits of 189 airlines. 181 accept both. 0 accept only the STM Prime, and 6 accept only the Alpine Sea Cove Bag 11L.
Only the Alpine Sea Cove Bag 11L fits
LC Perú, Lion Air Group, Spring Airlines, VivaColombia, Volaris, Wizz Air.
STM Prime vs. Alpine Sea Cove Bag 11L: which should you pack?
The STM Prime carries 4L more than the Alpine Sea Cove Bag 11L (15L vs. 11L), while the Alpine Sea Cove Bag 11L is the lighter pack at 0.5kg (vs. 0.7kg). For carry-on flexibility, the Alpine Sea Cove Bag 11L fits 99% of the airlines we track — the higher of the two. If you prioritise packing volume, choose the STM Prime; if you want to travel lighter, the Alpine Sea Cove Bag 11L is the better call.