The seller surprised me. I ordered only one package, for trial. Sent by the delivery service AE Saver Shipping, unprecedented generosity to purchase in 53R. I didn't believe it was my track and wrote to the seller. I received the parcel, everything is in order, except that the package is 40x60 instead of the specified 40x50. I'm even better-no more-no less. But if I selected for a certain size, say, shelves, it could be a problem. Now about the packages themselves (since I managed to order from several sellers). The outer size of them does not reach the specified approximately 1 cm in width and length. The inner size is about 3-4 cm smaller, respectively. The plastic is thin and hard, can burst in creases over time. After use, the package remains crumpled. The pump is not needed, the vacuum cleaner copes perfectly. I tried and used a few days-everything is fine. Probably, if you store for a long time, the air will leak, but in a tightly packed shelf or box, expand, I believe, it will be nowhere.