Alpha One-Niner SERT, PENUMBRA 2.0 Backpack vs. Alpha One-Niner Whitley Backpack
Two carry-on travel backpacks, compared spec for spec.
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 |
Feature by feature
| Alpha One-Niner SERT, PENUMBRA 2.0 Backpack | Feature | Alpha One-Niner Whitley Backpack |
|---|---|---|
| Storage | ||
| 2 | Compression | N |
| None | Expanded Capacity | None |
| 1 | Opening | 1 |
| front | Passport | front |
| Y | Passthrough | N |
| Carry | ||
| Y | Backpack | Y |
| optional | Hip Belt | N |
| removable | Sternum Strap | removable |
| Inside | ||
| 16in | Laptop | 16in |
| 5 | Main Compartments | 3 |
| Y | Organizer | Y |
| Outside | ||
| × | Hard Shell | × |
| N | Rain-fly | N |
| 2, side | Water Bottle Holder | 2, side |
| Y | Water Resistant | Y |
| Material | |
| Available in: X-Pac X42, 500D, 630D HD | Available in:X-Pac X42, 500D, 1050D Ballistic Nylon |
Alpha One-Niner Whitley Backpack
| Capacity | 20 L |
| Weight | 1.2 kg |
| Dimensions | 47×28×15 cm |
| Airline fit | 93% |
| Price | $200 |
Key differences between the Alpha One-Niner SERT, PENUMBRA 2.0 Backpack and Alpha One-Niner Whitley Backpack
- Compression straps: 2 on the Alpha One-Niner SERT, PENUMBRA 2.0 Backpack; No on the Alpha One-Niner Whitley Backpack.
- Luggage passthrough: Yes on the Alpha One-Niner SERT, PENUMBRA 2.0 Backpack; No on the Alpha One-Niner Whitley Backpack.
- Hip belt: Optional on the Alpha One-Niner SERT, PENUMBRA 2.0 Backpack; No on the Alpha One-Niner Whitley Backpack.
- Main compartments: 5 on the Alpha One-Niner SERT, PENUMBRA 2.0 Backpack; 3 on the Alpha One-Niner Whitley Backpack.
Both have: passport pocket, backpack straps, sternum strap, laptop sleeve, built-in organizer, water bottle pockets, water resistant.
Which airlines take each bag as a carry-on
We checked both bags against the carry-on size limits of 189 airlines. 175 accept both. 0 accept only the Alpha One-Niner SERT, PENUMBRA 2.0 Backpack, and 1 accept only the Alpha One-Niner Whitley Backpack.
Only the Alpha One-Niner Whitley Backpack fits
Great Lakes Airlines.
Alpha One-Niner SERT, PENUMBRA 2.0 Backpack vs. Alpha One-Niner Whitley Backpack: which should you pack?
The Alpha One-Niner SERT, PENUMBRA 2.0 Backpack carries 1L more than the Alpha One-Niner Whitley Backpack (21L vs. 20L), while the Alpha One-Niner Whitley Backpack is the lighter pack at 1.2kg (vs. 1.5kg). 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 Alpha One-Niner SERT, PENUMBRA 2.0 Backpack; if you want to travel lighter, the Alpha One-Niner Whitley Backpack is the better call.