STM Prime vs. Fjallraven Singi 20
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 | Fjallraven Singi 20 |
|---|---|---|
| Storage | ||
| N | Compression | 2 |
| None | Expanded Capacity | None |
| 0 | Opening | 4 |
| top | Passport | top |
| N | Passthrough | N |
| Carry | ||
| Y | Backpack | Y |
| N | Hip Belt | N |
| Y | Sternum Strap | removable |
| Inside | ||
| 13in | Laptop | 13in |
| 2 | Main Compartments | 3 |
| N | Organizer | N |
| Outside | ||
| × | Hard Shell | × |
| N | Rain-fly | N |
| 2, side | Water Bottle Holder | 2, side |
| Y | Water Resistant | Y |
| Material | |
| Polyester | 100% polyester 600D (recycled) |
Fjallraven Singi 20
| Capacity | 20 L |
| Weight | 0.7 kg |
| Dimensions | 43×28×16 cm |
| Airline fit | 96% |
| Price | $85 |
Key differences between the STM Prime and Fjallraven Singi 20
- Compression straps: No on the STM Prime; 2 on the Fjallraven Singi 20.
- Opening: Other on the STM Prime; Top zip on the Fjallraven Singi 20.
- Sternum strap: Yes on the STM Prime; Removable on the Fjallraven Singi 20.
- Main compartments: 2 on the STM Prime; 3 on the Fjallraven Singi 20.
Both have: passport pocket, backpack straps, laptop sleeve, water bottle pockets, 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. Every airline that takes one takes the other.
STM Prime vs. Fjallraven Singi 20: which should you pack?
The Fjallraven Singi 20 carries 5L more than the STM Prime (15L vs. 20L), while the STM Prime is the lighter pack at 0.7kg (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 Fjallraven Singi 20; if you want to travel lighter, the STM Prime is the better call.