Fjallraven Rucksack No. 21 Medium vs. Boundary Supply Errant X-Pac
Two carry-on travel backpacks, compared spec for spec.
Fjallraven Rucksack No. 21 Medium
| Capacity | 20 L |
| Weight | 0.96 kg |
| Dimensions | 44×28×13 cm |
| Airline fit | 96% |
| Price | $180 |
Feature by feature
| Fjallraven Rucksack No. 21 Medium | Feature | Boundary Supply Errant X-Pac |
|---|---|---|
| Storage | ||
| N | Compression | Y |
| None | Expanded Capacity | None |
| 3 | Opening | 3 |
| N | Passport | N |
| N | Passthrough | N |
| Carry | ||
| Y | Backpack | Y |
| N | Hip Belt | N |
| Y | Sternum Strap | Y |
| Inside | ||
| 15in | Laptop | 17in |
| 1 | Main Compartments | 1 |
| N | Organizer | N |
| Outside | ||
| × | Hard Shell | × |
| N | Rain-fly | N |
| 2 | Water Bottle Holder | 1 |
| Y | Water Resistant | Y |
| Material | |
| G-1000® HeavyDuty Eco: 65% polyester, 35% cotton | X-Pac |
Boundary Supply Errant X-Pac
| Capacity | 22 L |
| Weight | 1.4 kg |
| Dimensions | 48×29×14 cm |
| Airline fit | 93% |
| Price | $250 |
Key differences between the Fjallraven Rucksack No. 21 Medium and Boundary Supply Errant X-Pac
- Compression straps: No on the Fjallraven Rucksack No. 21 Medium; Yes on the Boundary Supply Errant X-Pac.
- Laptop sleeve: 15in on the Fjallraven Rucksack No. 21 Medium; 17in on the Boundary Supply Errant X-Pac.
- Water bottle pockets: 2 on the Fjallraven Rucksack No. 21 Medium; 1 on the Boundary Supply Errant X-Pac.
Both have: backpack straps, sternum strap, water resistant.
Which airlines take each bag as a carry-on
We checked both bags against the carry-on size limits of 189 airlines. 175 accept both. 6 accept only the Fjallraven Rucksack No. 21 Medium, and 0 accept only the Boundary Supply Errant X-Pac.
Only the Fjallraven Rucksack No. 21 Medium fits
Air Tahiti, American Eagle, easyJet, Great Lakes Airlines, Gulf Air, Ravn Alaska.
Fjallraven Rucksack No. 21 Medium vs. Boundary Supply Errant X-Pac: which should you pack?
The Boundary Supply Errant X-Pac carries 2L more than the Fjallraven Rucksack No. 21 Medium (20L vs. 22L), while the Fjallraven Rucksack No. 21 Medium is the lighter pack at 0.96kg (vs. 1.4kg). For carry-on flexibility, the Fjallraven Rucksack No. 21 Medium fits 96% of the airlines we track — the higher of the two. If you prioritise packing volume, choose the Boundary Supply Errant X-Pac; if you want to travel lighter, the Fjallraven Rucksack No. 21 Medium is the better call.