Biodegradable-Compostable (PLA-PVOH-aluminum-PVOH-PLA-PBAT)Maximum thickness 5.5 mils-microns, (per TUV-BPI certification, the proportion of aluminum (not compostable) is tiny and not deemed harmful)…good for products requiring 12 month or LESS shelf life…good for laundry powder and laundry liquid, candy, seeds, chocolate, freezer and frozen applications. Maximum weight 6.5 pounds.