When you buy the kit, it comes with quart bags, and I also bought some gallon bags.
It works great to suck all the air out with the pump.
So far, in the 3 weeks since I bought it, everything has come out perfectly. I have been cooking and freezing dinners, and it has worked great. The only thing that doesn't work well, is if it has much liquid in the bag - so no sauces. Anyway, if you give it a try, let me know how you like it.