STM Trilogy vs. Boundary Supply Rennen X-Pac Daypack
Two carry-on travel backpacks, compared spec for spec.
Feature by feature
| STM Trilogy | 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 |
| Y | Organizer | N |
| Outside | ||
| × | Hard Shell | × |
| N | Rain-fly | N |
| 2 | Water Bottle Holder | 1 |
| Y | 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 STM Trilogy and Boundary Supply Rennen X-Pac Daypack
- Built-in organizer: Yes on the STM Trilogy; No on the Boundary Supply Rennen X-Pac Daypack.
- Water bottle pockets: 2 on the STM Trilogy; 1 on the Boundary Supply Rennen X-Pac Daypack.
Both have: backpack straps, laptop sleeve, water resistant.
Which airlines take each bag as a carry-on
We checked both bags against the carry-on size limits of 189 airlines. 178 accept both. 0 accept only the STM Trilogy, and 1 accept only the Boundary Supply Rennen X-Pac Daypack.
Only the Boundary Supply Rennen X-Pac Daypack fits
Great Lakes Airlines.
STM Trilogy vs. Boundary Supply Rennen X-Pac Daypack: which should you pack?
The STM Trilogy carries 2L more than the Boundary Supply Rennen X-Pac Daypack (24L vs. 22L), while the STM Trilogy is the lighter pack at 0.64kg (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 STM Trilogy; if you want to travel lighter, the STM Trilogy is the better call.