I've tested a 24x33 8 mic foodgrade bag that will easily fit in a 5 gallon bucket. We have a 24x24 bag that will fit in a 3 gallon bucket - both with enough overhang to tie, and squeeze all of the air out. I've actually been using them without a bucket and have not had 1 leak.
Then we're also working on a 24x33 bag that's as thick as a Heavy Duty Ziplock Freezer bag....There are different kinds of foodgrade plastics, so I'm trying to see which one works the best, and at the lowest price...
Twisted Brisket BBQ Team
20"x24" Disposable Cutting Boards on a Perforated Roll