This bag was designed to take to the pub in winter! It fits all you need to take with a place for everything & room to stash your scarf, gloves or beanie - all the bits you don't want to leave on the table. It has a side zip for quick access to an outside compartment & zips securely closed at the top. The strap is not detatchable but adjustable, so you can keep it over your body if you like. 20 cm x 26 cm