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For flat bag, sheet, sleeve, and round bottom bags.

Width is measured from edge to edge. If it is a slit seal bag, measure inside seal to inside seal or inside seal to fold.
Bag length is measured from the top of the bag to the top of the bottom seal or fold.
Sleeve or sheet length is measured from cut edge to cut edge.

You may also try our bag calculator to help find the right sized back for you.