Tried mine for the first time. Didn't buy specific bread to fit the bag, who takes a ruler when they go shopping? Used what I had in which was medium sliced (how thin is medium these days?) 11.5cm x 15cm. Single filling of grilled bacon. Got the sandwich in the bag, snug fit. Sandwich toasted well but the top 3cm did not toast as this was outside the toaster, probably a fault with my toaster rather than the bag, though my toaster is of a usual size. Check your toaster's dimensions. I think an idea would be a choice of bag of similar dimensions but with the opening along the longer side. Don't be tempted to turn up your toaster setting.