I have wasted countless gallon ziplock bags when traveling - just unscrew the lids and put some plastic wrap over the opening then screw the lid back on for a much easier spill solution! (not quite as safe as a plastic bag, but a good idea!
FUNNIEST THING EVER: foolproof anti-theft device = maxi pad wrapper! "Ladies: a wallet that will never be stolen from your purse or How to hide money from the man and kids in your life. This is so funny!