A 25 litre roll-top dry bag. 25 cm (9.8 in.) diameter x 66 cm (26 in.) high. Deep Blue.

Fabric: recycled PET (R-PET) 210T with a TPU lamination. Roll-top closure with buckles. Coghlan's calls it fully waterproof.

Roll the top at least three times before you clip it. That is not a suggestion — a roll-top seals by the pressure of the folds against each other, and one or two turns is a bag with a slot in the top of it. Three or more, then buckle.

The TPU lamination is the waterproof layer and the recycled polyester is the fabric that protects it, which is why these should be packed, not dragged.

Made from recycled material.

Twenty-five litres is the size most people actually need. It swallows a sleeping bag, or a full change of clothes and a towel, or everything soft in a canoe — and it is still short enough to stand upright in a footwell or lash to a rack without hanging over the edge.

For anything on water, this is the one that earns its money the first time the weather turns.