Pouches only work with chamber vacuum machines, creating a secure vacuum and a tight seal. They eliminate freezer burn and dehydration, and can be frozen, refrigerated, microwaved or boiled. Heavy-duty 3-mil construction ensures increased puncture and abrasion resistance. Transparent for easy identification of contents. Sizes:8 x 10 (500 count), 10 x 13 (250 count). Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Vacuum Sealer Bags.