Osprey Daylite Expandable 26+6 Travel Pack, Gray OS | travel backpack, carry on bag, laptop sleeve, personal item, Gray color, OS size

The Daylite Expandable opens like a suitcase, with a full zip and a mesh divider, and Osprey sizes it to airlines' personal-item limits (accepted by 85% of the biggest airlines, it says). Unzip the expansion and the main compartment grows by 2 inches, or 6 litres, which makes it a standard carry-on instead.

There is a laptop sleeve against the back, a trolley-handle pass-through, two stretch bottle pockets, a sternum strap and grab handles on top, side and bottom. It weighs 0.84 kg. It suits weekend trips and fares that charge for the overhead bin; for a week of clothes, a bigger travel pack makes more sense.

Worth knowing Expanded, it no longer fits personal-item limits. Osprey calls the laptop sleeve simple: a sleeve against the back wall. This deal is for the gray colour.