Kathmandu Solus Pack 20 vs. Boundary Supply Rennen X-Pac Daypack
Two carry-on travel backpacks, compared spec for spec.
Kathmandu Solus Pack 20
| Capacity | 20 L |
| Weight | 0.42 kg |
| Dimensions | 47×28×19 cm |
| Airline fit | 93% |
| Price | $60 |
Feature by feature
| Kathmandu Solus Pack 20 | Feature | Boundary Supply Rennen X-Pac Daypack |
|---|---|---|
| Storage | ||
| N | Compression | N |
| None | Expanded Capacity | None |
| 4 | Opening | 4 |
| N | Passport | N |
| N | Passthrough | N |
| Carry | ||
| Y | Backpack | Y |
| N | Hip Belt | N |
| N | Sternum Strap | N |
| Inside | ||
| 15in | Laptop | 15in |
| 1 | Main Compartments | 1 |
| N | Organizer | N |
| Outside | ||
| × | Hard Shell | × |
| N | Rain-fly | N |
| N | Water Bottle Holder | 1 |
| N | Water Resistant | Y |
| Material | |
| 100% Polyester | Custom VX21 X-Pac material |
Boundary Supply Rennen X-Pac Daypack
| Capacity | 22 L |
| Weight | 0.9 kg |
| Dimensions | 46×28×18 cm |
| Airline fit | 95% |
| Price | $170 |
Key differences between the Kathmandu Solus Pack 20 and Boundary Supply Rennen X-Pac Daypack
- Water bottle pockets: No on the Kathmandu Solus Pack 20; 1 on the Boundary Supply Rennen X-Pac Daypack.
- Water resistant: No on the Kathmandu Solus Pack 20; Yes on the Boundary Supply Rennen X-Pac Daypack.
Both have: backpack straps, laptop sleeve.
Which airlines take each bag as a carry-on
We checked both bags against the carry-on size limits of 189 airlines. 176 accept both. 0 accept only the Kathmandu Solus Pack 20, and 3 accept only the Boundary Supply Rennen X-Pac Daypack.
Only the Boundary Supply Rennen X-Pac Daypack fits
American Eagle, easyJet, Ravn Alaska.
Kathmandu Solus Pack 20 vs. Boundary Supply Rennen X-Pac Daypack: which should you pack?
The Boundary Supply Rennen X-Pac Daypack carries 2L more than the Kathmandu Solus Pack 20 (20L vs. 22L), while the Kathmandu Solus Pack 20 is the lighter pack at 0.42kg (vs. 0.9kg). For carry-on flexibility, the Boundary Supply Rennen X-Pac Daypack fits 95% of the airlines we track — the higher of the two. If you prioritise packing volume, choose the Boundary Supply Rennen X-Pac Daypack; if you want to travel lighter, the Kathmandu Solus Pack 20 is the better call.