5 gallons converts to about 19 liters.
So 1 5 gallon bucket wouldn't be enough if a 30 liter barrel serves your needs?
You'd have to go with 2-5 gal buckets and figure a way to carry them besided by hand or swinging from a neck yoke :'(

I tried putting a 5 gallon bucket in my Granite Gear food pack.
It will fit standing up but not sideways, so I'd have to carry whatever didn't fit in bucket, loose around bucket in pack.
I have enough height so to modify from hanger to hider, I'd probably go for 30 litter blue barrel that would hold all food items.

I could see 5 gallon pails in certain situiations that didn't involve much portaging or you had enough paddlers that some could be designated bucket bearers.
For tandem or solo people, you need some sort of pack system to put weight on back/legs and the option to carry a canoe.

This might be a good source for barrels/screw lid pails.
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