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Trek Pro 50L Expedition Pack
46 to 65 litres · checked only · 2.15 kg

The 38-litre Nomad travel backpack, for trips that outgrow a carry-on. Same clamshell layout and 16-inch laptop sleeve as the 28L, 1.28 kg, in black, navy and sand. At 55 cm tall it exceeds most cabin limits, so treat it as checked luggage. Water resistant rather than waterproof.
The same design as the Nomad 28L, ten litres larger. That is enough to change what the bag is for: a fortnight without laundry, or a week in winter clothing, rather than a disciplined carry-on trip.
Clamshell opening, the same externally-accessed 16-inch laptop sleeve, and two extra compression straps to hold the larger volume in shape when it is not full.
At 55 cm tall it is over the cabin limit for most carriers, so this is a checked bag that happens to be comfortable to carry. If cabin-only travel is the point of the trip, take the 28L and pack more carefully.
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46 to 65 litres · checked only · 2.15 kg
36 to 45 litres · cabin approved · 2.35 kg