One broke within 3 days.
I bought these for a backpacking trip around Asia and was amazed at how much more they allowed me to fit into my bag.<br /><br />I'd made sure not to overfill, and followed their instructions, and all that jazz.  One broke in the first three days, before I ever got a chance to pull it out of my bag.  I only brought the two big ones with me, and the other one is still going strong (two months later), but I'd probably not buy these particular space saver bags again.
Rating: 2 stars