You know, I've had mixed success with the pump-seal ziplocs. It seems that if you use them for freezer storage, they work quite well. I use them to vacuum seal fish, and have never had a seal break yet. But I stored a whole bunch of rice and beans in them, and many of the bags lost their seal over time. Maybe they're just for freezer storage, and I never checked? I just thought since they work so well for the freezer, they'd work for other stuff, so I got some and used them for dry storage.