Boundary Supply Errant Pack X-Pac vs Tropicfeel Shell Backpack
The Boundary Supply Errant Pack X-Pac is 20L and 1.4kg3.1lb; the Tropicfeel Shell Backpack is 20L and 1.4kg3.1lb. They weigh the same. The Tropicfeel Shell Backpack costs $60 less. The Boundary Supply Errant Pack X-Pac fits the carry-on limit of 36 of 36 major airlines and the Tropicfeel Shell Backpack fits 31; under the seat, 0 and 0 of 26.
| Spec | Boundary Supply Errant Pack X-Pac | Tropicfeel Shell Backpack |
|---|---|---|
| Price | $299 | $239Best |
| Volume | 20L | 20L |
| Expands to | n/a | 40L |
| Weight | 1.4kg3.1lb | 1.4kg3.1lb |
| Carry-on compliance | 100%Best | 86% |
| Personal-item compliance | 0% | 0% |
| Dimensions | 48×26×14cm19×10×5.5in | 50×30×23cm19.5×12×9in |
| Laptop | 16" | 16" |
| Bottle pockets | 1 | n/a |
| Compression straps | 0 | n/a |
| Opening | Clamshell | Clamshell |
| Warranty | Lifetime | Lifetime |
| Organizer | Yes | Yes |
| Shoe compartment | Yes | No |
| Hydration sleeve | No | No |
| Frame sheet | No | No |
| Water-resistant | Yes | Yes |
| Rain cover | No | No |
| MOLLE | No | No |
| Hip belt | No | Hideable |
| Sternum strap | No | No |
| Load lifters | No | No |
| Shoulder strap | No | No |
| Luggage pass-through | Yes | No |
| Camera compartment | Insert sold separately | No |
| Material | X-Pac VX21 | 900D Oxford polyester, 50% recycled, PU-coated |
| Last checked | 2026-09 | 2026-09 |
Where their airline fit differs
| Airline | Limit | Boundary Supply Errant Pack X-Pac | Tropicfeel Shell Backpack |
|---|---|---|---|
| Air Arabia | Carry-on | Fits | Too big |
| Air India | Carry-on | Fits | Too big |
| Emirates | Carry-on | Fits | Too big |
| Ryanair | Carry-on | Fits | Too big |
| Vueling | Carry-on | Fits | Too big |
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Specs come from each brand's own product page. Fit uses listed dimensions in any orientation. How we score carry-on fit.