How many times and how long can you use a reusable bag depends on how it is being used and the appearance of the bag (too damaged to reuse) . If tearing are already visible, and there is already leaking then its time to change to a new reusable storage bag. It also depends on the thickness and durability of the product. At time, a thick bags can be used up t0 25 times as compared to a thinner bags.