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!
Summer means beach vacation and beach vacation means sand. So here's the fix: baby powder. It's like sand's kryptonite. Generously douse yourself before leaving the beach: the powder soaks up the sweat