A small roll of that universal expedition repair kit - extra strong, very sticky, all-purpose Duct Tape (also known as Duck Tape, Gaffer Tape etc) with excellent water resistance.
It can be used to fix, bond, mount, repair, join, seal, reinforce and protect all sorts of things effectively and has proved a lifesaver in numerous cases of dropped boots at altitude where a Karrimat, pocket knife and Duct Tape have saved the day, if not the toes.
5 metres of 50mm tape - a neat roll, ca 53mm diameter.
25g