Have only used them to freeze food, but am very happy with them so far. They're especially useful if you want to fit more in a freezer with limited space.
I have been very impressed with these bags, they are very easy to use. This snack size is perfect for freezing food portions, and I've found the best way to clean these is to turn them inside out and stand them up in the dishwasher - they come out clean every time. Very pleased with the product, will buy more soon!
Very good quality bag, food stays fresh for much longer in it. Happy with the purchase.