My eldest son tried that once (fish in a ziplock plastic bag) and the local raccoons had a feast.

I can't hang stuff (being a horrible thrower and having arthritis to boot), so i use an Ursack. The S29 model is legal to use in jurisdictions that state that IGBC (Interregional Brizzly Bear Committee) approved containers must be used.
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May your trails be crooked, winding, lonesome, dangerous, leading to the most amazing view--E. Abbey