The Droplet is compact enough to fit on a keychain & large enough to fit a whole outfit in. It also works as a dry bag, keeping water away from things thatprefer to stay dry. Use it to secure items that might leak in your luggage & organize small items. Keep a Droplet in your keychain, pack one in yourgym bag or stash one in your luggage. Droplets protect your stuff, & so much more.