Bucklesafe now makes it possible to lock the side-release buckles that are found on many top-loading backpacks and other bags. The included TSA approved padlocks mean even checked luggage can be locked, as security agents in airports can open and relock the BuckleSafe during inspection, using secured tools. Two BuckleSafes and two 22mm solid brass TSA padlocks per pack. Straps can be tightened but not be loosened once locked. Designed to fit standard 1" / 25mm single side adjustable side-release buckles. Material: Polycarbonate. Weight (including lock): 54 g / 1.9 oz.