How many sacks of feed are you planning to store?
Myself, I load up with a half dozen to a dozen, and just store the sacks of feed flat on a skid in the basement.
I store the feed I'm actively using in a trashcan.  It holds 100 lbs of feed, which suits me just fine.  It certainly does not move easily with that amount in it, so I make sure it's where I want it before I fill it.
For some reason, the rats around here have never learned then can gnaw through plastic trashcans.  So I've not had a single incident with the plastic cans.  While I've many metal cans, I do prefer the pastic since they don't rust up outside.  Should my rats finally learn they can gnaw through plastic, I'll switch.