Calpak Terra 26L Laptop Duffel Backpack: 18 x 12 x 7.5 in
26l-backpack-duffel, backpack, no wheels, 2.9 lb empty. Exterior figures are the maker's own.

The maker's exterior figure excludes wheels and handles, so the bag's real footprint in an airline sizer is larger than these numbers.
Cabin approved at 19 of 19 airlines
The table below shows the verdict at every airline, best fit first, using the same math as the live fit checker. For why so many carry-ons fail the US standard box, see our 22 x 14 x 9 breakdown.
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Does the Terra 26L Laptop Duffel Backpack fit? All 19 airlines
18 x 12 x 7.5 in against each airline's published carry-on box, largest side to largest side, sorted best fit first.
| Airline | Cabin max (in) | Verdict | Under seat |
|---|---|---|---|
| Sun Country Airlines | 24 x 16 x 11 | Cabin approved3.5 in to spare | No |
| Allegiant Air | 22 x 16 x 10 | Cabin approved2.5 in to spare | Yes |
| British Airways | 22 x 18 x 10 | Cabin approved2.5 in to spare | No |
| Frontier Airlines | 24 x 16 x 10 | Cabin approved2.5 in to spare | Yes |
| Southwest Airlines | 24 x 16 x 10 | Cabin approved2.5 in to spare | not published |
| Air France | 21.7 x 13.8 x 9.9 | Cabin approved1.8 in to spare | No |
| Qatar Airways | 19.69 x 14.57 x 9.84 | Cabin approved1.7 in to spare | not published |
| Lufthansa | 21.65 x 15.75 x 9.06 | Cabin approved1.6 in to spare | No |
| Turkish Airlines | 21.65 x 15.75 x 9.06 | Cabin approved1.6 in to spare | No |
| Air Canada | 21.5 x 15.5 x 9 | Cabin approved1.5 in to spare | No |
| Alaska Airlines | 22 x 14 x 9 | Cabin approved1.5 in to spare | not published |
| American Airlines | 22 x 14 x 9 | Cabin approved1.5 in to spare | Yes |
| Avelo Airlines | 22 x 14 x 9 | Cabin approved1.5 in to spare | No |
| Delta Air Lines | 22 x 14 x 9 | Cabin approved1.5 in to spare | not published |
| Hawaiian Airlines | 22 x 14 x 9 | Cabin approved1.5 in to spare | not published |
| JetBlue Airways | 22 x 14 x 9 | Cabin approved1.5 in to spare | No |
| United Airlines | 22 x 14 x 9 | Cabin approved1.5 in to spare | No |
| Emirates | 21.65 x 14.96 x 8.66 | Cabin approved1.2 in to spare | not published |
| Ryanair | 21.65 x 15.75 x 7.87 | Tight squeeze0.4 in to spare | No |
Bag spec source: calpaktravel.com · accessed 2026-07-09. Airline limits come from each carrier's official baggage page; open an airline above for its citations. Policies change, so verify a borderline case before you fly.
Calpak states all luggage dimensions in inches on its own product pages. For hardside luggage (Ambeur, Hue) the specifications section explicitly labels the larger figure Exterior, Including wheel, with a separate smaller Interior figure for packing space, so the exterior number already accounts for wheels and handles. For softside duffels and the Terra backpack duffel it publishes a single Dimensions figure since those bags have no wheels. On at least two Ambeur and one Terra product page, an older marketing bullet elsewhere on the same page states a slightly different, usually lower, dimension or weight than the labeled specifications section; the labeled specifications figure was treated as authoritative in this dataset, with the alternate figure noted per bag.
All 12 Calpak bags