I see many reviews stating the bags don't hold the vacuum seal. Yes, here and there you get one that won't hold a seal...but, seriously, for the price you can't beat it. Far and away, most all the bags do a great job, if you make sure the zipper is closed and rub your finger over the valve after pumping all the air out. I can put fresh baked bread in these and remove the air, and they will keep for about 10 days in the fridge. Now, anyone who bakes fresh breads knows, it only takes about 3 days to see mold on your loaves, so this is a great product for stuff like that. I also seal up meat, cheese, veggies, fruit, you name it. I think the best thing I've found so far to do with these bags would be 1. freezing on sale bananas for my morning smoothies. Just peal, freeze overnight on a sheet pan. Load the large zip loc with about 6 or so and pump the air out. You can open, remove desired amount and reseal with no problems. And 2. marinating meats. You'll be surprised at how deeply your marinade/bourbon/wine, etc, penetrates the meat when it's done in a vacuum sealed bag. And since the pump is easily cleaned, I don't worry about a little marinade/meat juice getting on it. All in all, a very good value for your hard earned grocery dollars.