Game changing space saver!TLDR: The vacuum bag works great and I REALLY LOVE the electric vacuum sealer. If you have used the manual pump before, you will understand how useful this device is.Just to give everyone my account while using it. I have a backpack that has very similar dimensions to Frontier Airline's personal item requirement: 14 in tall, 18 in wide, and 8 in long. I used a medium-sized bag with a long airgap on top but the small bag would of worked just right. For perspective, using the medium-sized bag, I only used about 1/2 of the bag, which fit about 2 outfits and 1 set of PJ and on top of that, I packed an extra pair of shoes. Alternatively, if I didn't bring an extra pair of shoe, it definitely could of 3/4 of the bag. Regardless, it fit in my backpack and it was technically 1 in over in depth but when I put it in the Frontier measuring tool at the airport, it was fine because the clothes compressed again, which probably means I didn't suck all of the air out yet.Leak test: I used the bag multiple times before going on my trip because I had a difficult time putting it into my backup because I overpacked it. As a fun test, I sealed up the bag with clothes to see how much it leaked. After 24 hours, it seems to hold its shape really well, though I have noticed that some air got into the bag.0