Boundary Supply -- Prima System Modular Travel Backpack vs. Eagle Creek Convertabrief
Two carry-on travel backpacks, compared spec for spec.
Boundary Supply -- Prima System Modular Travel Backpack
| Capacity | 22 L |
| Weight | 1.4 kg |
| Dimensions | 49×28×13 cm |
| Airline fit | 92% |
| Price | $268 |
Feature by feature
| Boundary Supply -- Prima System Modular Travel Backpack | Feature | Eagle Creek Convertabrief |
|---|---|---|
| Storage | ||
| Y | Compression | Y |
| 30L | Expanded Capacity | None |
| 0 | Opening | 4 |
| Y | Passport | Y |
| Y | Passthrough | Y |
| Carry | ||
| Y | Backpack | hideable |
| removable | Hip Belt | N |
| removable | Sternum Strap | N |
| Inside | ||
| 17in | Laptop | 17in |
| 1 | Main Compartments | 1 |
| Y | Organizer | Y |
| Outside | ||
| × | Hard Shell | × |
| N | Rain-fly | N |
| 1 | Water Bottle Holder | N |
| Y | Water Resistant | Y |
| Material | |
| Nywool, Nylon, Kodra Nylon | Bi-Tech™ Heather, 1000D Helix™ Poly Twill |
Eagle Creek Convertabrief
| Capacity | 26.5 L |
| Weight | 1.41 kg |
| Dimensions | 45×32×20 cm |
| Airline fit | 95% |
| Price | $199 |
Key differences between the Boundary Supply -- Prima System Modular Travel Backpack and Eagle Creek Convertabrief
- Opening: Other on the Boundary Supply -- Prima System Modular Travel Backpack; Top zip on the Eagle Creek Convertabrief.
- Backpack straps: Yes on the Boundary Supply -- Prima System Modular Travel Backpack; Hideable on the Eagle Creek Convertabrief.
- Hip belt: Removable on the Boundary Supply -- Prima System Modular Travel Backpack; No on the Eagle Creek Convertabrief.
- Sternum strap: Removable on the Boundary Supply -- Prima System Modular Travel Backpack; No on the Eagle Creek Convertabrief.
- Water bottle pockets: 1 on the Boundary Supply -- Prima System Modular Travel Backpack; No on the Eagle Creek Convertabrief.
Both have: compression straps, passport pocket, luggage passthrough, laptop sleeve, built-in organizer, water resistant.
Which airlines take each bag as a carry-on
We checked both bags against the carry-on size limits of 189 airlines. 172 accept both. 2 accept only the Boundary Supply -- Prima System Modular Travel Backpack, and 7 accept only the Eagle Creek Convertabrief.
Only the Boundary Supply -- Prima System Modular Travel Backpack fits
Air Niugini, Great Lakes Airlines.
Only the Eagle Creek Convertabrief fits
Air Tahiti, American Eagle, easyJet, Gulf Air, Ravn Alaska, Regional Express, Virgin Australia.
Boundary Supply -- Prima System Modular Travel Backpack vs. Eagle Creek Convertabrief: which should you pack?
The Eagle Creek Convertabrief carries 4.5L more than the Boundary Supply -- Prima System Modular Travel Backpack (22L vs. 26.5L), while the Boundary Supply -- Prima System Modular Travel Backpack is the lighter pack at 1.4kg (vs. 1.41kg). For carry-on flexibility, the Eagle Creek Convertabrief fits 95% of the airlines we track — the higher of the two. If you prioritise packing volume, choose the Eagle Creek Convertabrief; if you want to travel lighter, the Boundary Supply -- Prima System Modular Travel Backpack is the better call.