Bought these to replace a different brand I'd purchased that didn't stay sealed. Not only could I get a better seal with these bags, and the seal held, but the pump really got ALL the air out so my pillows are very flat and easy to store now.I did not recognize the brand name and was a little skeptical at first, but these work better than any "name" brand ones that I have used. The bags stay flat and compressed. No leaks!!The size is perfect for my RV storage area. It's the best way store your wardrobe when space is severely limited.Out of the four bags I have used so far only one has remained sealed. They come folded so the opening of the bags have a crease in them. They seal up like a zip lock baggie. I believe the crease is where the air is seeping back in. Going to try using a heat pack and weight on that area to try to eliminate the crease problem. They are very sturdy so don't have to worry about tearing them.It’s very easy to use. Save a lot of space for my closet. Will buy moreWorked wellThese are junk, You look at them wrong and they split open. 2 of the bags wouldn't even hold vacuum right out of the package. Pump did work but VERY slowly.Looks small when you open them but surprisingly spaces