Polyethylene Blend All polyethylene bags are not created equally. The polyethylene used for this bag is made using a high-tech manufacturing process that makes the material highly pliable, but much tougher and tear resistant than regular polyethylene bags. Equivalent to 6-8 mil regular polyethylene bags. Made in the USA and free of BPA and Phthalates. This is the best way to protect and preserve your crib mattress during moving and storage. 28.5" x 7" x 64" mattress bag fits all standard-sized American crib mattresses. Seal the open end with packing tape to protect from water, bugs, and dust. Hulsky crib mattress storage bags help to protect and preserve your crib mattress while it's not in use. Perfect for moving or temporary storage during family expansion years. The 28.5" x 7" x 64" crib mattress bag fits all standard sized American crib mattresses. Waterproof, keeps dirt and dust from touching your crib mattress. Made in the USA from extra-tough 100% virgin polyethylene. BPA and phthalate free. Close with packing tape to provide a secure and customized fit.