FYI - The 8"x12" 2 quart bags will hold 4x regular round tins, 2x C&D/Pease type tins, or 1 500g GH&C box, without having difficulties getting enough of the bag in the food saver to seal.
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Here's a couple of my older posts on the subject:
Not sure if my method is any good or not but I thought I'd post it to give others here some ideas. I don't smoke a lot so it takes me some time to get through a tin but I like to take advantage of sales. When SPC Please Pudding SR is on sale at buy 2 get 1 free, I buy 4 and get 2 free. Here's...
www.pipesmagazine.com
Just for those that are curious: Here's what $65 gets you: A bx delivered with 100 8'x12" 5mil bags and 100 500cc oxy absorbers: The bags can be written on nicely with a sharpie and it doesn't smear when dry (only takes a couple seconds to dry) and I use the sealer on my 15 year old...
www.pipesmagazine.com
An additional thought on the oxy absorbers: They seem to be not required whatsoever but they do reduce the size after bagging/sealing and makes for a little more ease in storing in plastic totes/boxes/whatever.