They’re like the Mickey Minnie bag you posted. Problem is they have no cardboard insert so it is hard to use it for groceries or anything heavy because the bottom just bows down.If it’s a reusable bag similar to this one that we used to sell at the Disney Store with a plastic bottom insert and all, then all ya’ need to do is take out the plastic insert, and, folded up just right, it will still be able to, bulgingly, fit in a pocket.
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But, If it’s just a plain, thin plastic Disney Parks merch bag that you get with your purchase, those things are “reusable” enough, and will fold up tighter than a gnats rear end stretched over a wagon wheel...!!!