After doing more research than I needed I decided to use these bags instead of others. read and heard great things. I received the set pretty quickly. the instructions were almost more confusing than without them, but all said and done. looks great. LOOKS. One side keeps shifting and not holding air properly. I checked everything, tracked everything. and everything can be completed. bad bags. So now I either have to take the time to take everything apart, send them back and probably wait for a replacement, or I buy this replacement bag that I could find from a local supplier. and let him replace it for me. Adding a HUGE additional cost to the entire study. More than upset. I'm disappointed