KS Ultralight KS27 vs. Tom Bihn Aeronaut 30L
Two carry-on travel backpacks, compared spec for spec.
KS Ultralight KS27
| Capacity | 27 L |
| Weight | 0.3 kg |
| Dimensions | 55×28×16 cm |
| Airline fit | 87% |
| Price | $130 |
Feature by feature
| KS Ultralight KS27 | Feature | Tom Bihn Aeronaut 30L |
|---|---|---|
| Storage | ||
| 2 | Compression | N |
| None | Expanded Capacity | None |
| 0 | Opening | 0 |
| top | Passport | side |
| N | Passthrough | N |
| Carry | ||
| Y | Backpack | hideable |
| removable | Hip Belt | removable |
| removable | Sternum Strap | removable |
| Inside | ||
| N | Laptop | N |
| 2 | Main Compartments | 5 |
| N | Organizer | N |
| Outside | ||
| × | Hard Shell | × |
| N | Rain-fly | N |
| 2, side | Water Bottle Holder | N |
| Y | Water Resistant | Y |
| Material | |
| X-pac VX 07 YKK "waterproof zip" | 1050 denier ballistic nylon OR ultralight 400d Halcyon/420d nylon ripstop 200 denier Halcyon/nylon ripstop fabric lining |
Tom Bihn Aeronaut 30L
| Capacity | 30 L |
| Weight | 1.3 kg |
| Dimensions | 50×32×20 cm |
| Airline fit | 91% |
| Price | $330 |
Key differences between the KS Ultralight KS27 and Tom Bihn Aeronaut 30L
- Compression straps: 2 on the KS Ultralight KS27; No on the Tom Bihn Aeronaut 30L.
- Passport pocket: Top on the KS Ultralight KS27; Side on the Tom Bihn Aeronaut 30L.
- Backpack straps: Yes on the KS Ultralight KS27; Hideable on the Tom Bihn Aeronaut 30L.
- Main compartments: 2 on the KS Ultralight KS27; 5 on the Tom Bihn Aeronaut 30L.
- Water bottle pockets: 2, side on the KS Ultralight KS27; No on the Tom Bihn Aeronaut 30L.
Both have: hip belt, sternum strap, water resistant.
Which airlines take each bag as a carry-on
We checked both bags against the carry-on size limits of 189 airlines. 163 accept both. 1 accept only the KS Ultralight KS27, and 9 accept only the Tom Bihn Aeronaut 30L.
Only the KS Ultralight KS27 fits
Great Lakes Airlines.
Only the Tom Bihn Aeronaut 30L fits
Belavia, Etihad Airways, Liat Airlines, Oman Air, Qatar Airways, Royal Jordanian, Scoot, Tiger Airways, WestJet.
KS Ultralight KS27 vs. Tom Bihn Aeronaut 30L: which should you pack?
The Tom Bihn Aeronaut 30L carries 3L more than the KS Ultralight KS27 (27L vs. 30L), while the KS Ultralight KS27 is the lighter pack at 0.3kg (vs. 1.3kg). For carry-on flexibility, the Tom Bihn Aeronaut 30L fits 91% of the airlines we track — the higher of the two. If you prioritise packing volume, choose the Tom Bihn Aeronaut 30L; if you want to travel lighter, the KS Ultralight KS27 is the better call.