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its my understanding that a 1 gallon bubblebag is made to fit a 1 gallon bucket... they sell them in home-improvement/hardware outfits or maybe u could get away with a cheapo garbage bin from a dollar-store or maybe even try a deli or Diner (family restaurant) and ask them if you may have an empty pickle tub, or the like, it may be 1 gallon, i believe they are, could be wrong tho, worth a shot.
hope this helps
if i owned bubblehash making bags, or was familiar with the specs/dynamics i'd give a definite answer but since i don't, this is what you're gettin... lol