We have been searching for
We have been searching for alternatives to plastics for refrigerator and freezer food storage. The Zip Top containers are constructed with heavier weight/thickness materials. The containers stand up independently vertically better, and the Zip Top closures seem more secure (this is compared with Stasher containers, which we also tried). They go from freezer to fridge to microwave and through the dishwasher without a problem. The price is a bit steep, but its an investment in plastic free food storage. I feel optimistic about their long term durability and we will gradually make the switch over time. Glad I found this product!