I'd go with an OPSAK (makers of Aloksak). It's an airtight, waterproof and odorproof bag. I'd put the OPSAK in a stuffsack (Don't stuff it so hard that you break the OPSAK seal), attach a line and hang it in a tree away from camp "just in case".

OPSAK
_________________________
"Learn survival skills when your life doesn't depend on it."