like anything else, you DO NOT always get what you pay for! I've used well known and never heard of, both occasionally won't seal or have a pin hole but when they work they're great. When I change out winter/summer clothes I use them to put in the attic, most even hold up in that heat/cold. Fold things as tightly as possible so you can get plenty in the bag, just don't cram it full, you may bust the seam. Every time I get one done I always think I could have put a lot more in it but that's because they shrink up SO much.