Aer Travel Pack 2 Small vs. Alpha One-Niner SERT, PENUMBRA 2.0 Backpack
Two carry-on travel backpacks, compared spec for spec.
Aer Travel Pack 2 Small
| Capacity | 28 L |
| Weight | 1.7 kg |
| Dimensions | 48×33×19 cm |
| Airline fit | 92% |
| Price | $229 |
Feature by feature
| Aer Travel Pack 2 Small | Feature | Alpha One-Niner SERT, PENUMBRA 2.0 Backpack |
|---|---|---|
| Storage | ||
| 4 | Compression | 2 |
| None | Expanded Capacity | None |
| 1 | Opening | 1 |
| top, side | Passport | front |
| Y | Passthrough | Y |
| Carry | ||
| Y | Backpack | Y |
| optional | Hip Belt | optional |
| removable | Sternum Strap | removable |
| Inside | ||
| 16in | Laptop | 16in |
| 5 | Main Compartments | 5 |
| Y | Organizer | Y |
| Outside | ||
| × | Hard Shell | × |
| N | Rain-fly | N |
| 1, side | Water Bottle Holder | 2, side |
| Y | Water Resistant | Y |
| Material | |
| 700D Cordura | Available in: X-Pac X42, 500D, 630D HD |
Alpha One-Niner SERT, PENUMBRA 2.0 Backpack
| Capacity | 21 L |
| Weight | 1.5 kg |
| Dimensions | 47×30×14 cm |
| Airline fit | 93% |
| Price | $255 |
Key differences between the Aer Travel Pack 2 Small and Alpha One-Niner SERT, PENUMBRA 2.0 Backpack
- Compression straps: 4 on the Aer Travel Pack 2 Small; 2 on the Alpha One-Niner SERT, PENUMBRA 2.0 Backpack.
- Passport pocket: Top, side on the Aer Travel Pack 2 Small; Front on the Alpha One-Niner SERT, PENUMBRA 2.0 Backpack.
- Water bottle pockets: 1, side on the Aer Travel Pack 2 Small; 2, side on the Alpha One-Niner SERT, PENUMBRA 2.0 Backpack.
Both have: luggage passthrough, backpack straps, hip belt, sternum strap, 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. 174 accept both. 0 accept only the Aer Travel Pack 2 Small, and 1 accept only the Alpha One-Niner SERT, PENUMBRA 2.0 Backpack.
Only the Alpha One-Niner SERT, PENUMBRA 2.0 Backpack fits
Air Niugini.
Aer Travel Pack 2 Small vs. Alpha One-Niner SERT, PENUMBRA 2.0 Backpack: which should you pack?
The Aer Travel Pack 2 Small carries 7L more than the Alpha One-Niner SERT, PENUMBRA 2.0 Backpack (28L vs. 21L), while the Alpha One-Niner SERT, PENUMBRA 2.0 Backpack is the lighter pack at 1.5kg (vs. 1.7kg). For carry-on flexibility, the Alpha One-Niner SERT, PENUMBRA 2.0 Backpack fits 93% of the airlines we track — the higher of the two. If you prioritise packing volume, choose the Aer Travel Pack 2 Small; if you want to travel lighter, the Alpha One-Niner SERT, PENUMBRA 2.0 Backpack is the better call.