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 - CBJ
Disposables By STARK
Disposable Cutting Boards on a Perforated Roll, 5 gl Bucket Liners, Steam Pan Liners, Cooler Liners, Stark Naked BBQ Pit, Probe & Grill Stripper