On mine you can seal any bag upto 28cm . Wide enough for what we need . Any bigger and I think you may be going into catering size. With it having heat seal only as well, you can make whatever size bag you want by folding the bigger bags sealing along the fold and cutting between the seal.I would not be without it, it is my only electric gadget apart from a kettle that gets used when the rayburn is out.(very rare). All the best Hermit