Here is one i think you monkeys will love.Great for moving stacked buckets of your stored food products around. go to Original Bucket Dolly | Home
Might be a good thing on "smooth" floors. You might make a platform for it so bags will not get a round cut on the bottom sack. Price not given on the website.
they make a double roller looks to be about 3 ft. long.price of the single is 34.95 is what i saw.a little pricey but what isn't these days.we can always make our own,which is what i plan to do.
Seems kind of specialized for me. Hand truck and/or flat dolly will move just about anything and are easier to control. Gave me an interesting idea for under stacks of buckets in storage to make it possible to get more in a space and still have everything accessible though...