Clear self-seal poly bag with 1.5 mil thickness and printed suffocation warning; made from polyethylene material to help protect contents from dust and moisture while allowing product visibility Discover Shop4Mailers' premium clear plastic resealable poly bags, each 1.5 mil thick and equipped with a Suffocation Warning. Our user-friendly poly bags come with a label in three languages—English, French, and Spanish. Choose from our diverse range of poly bags to meet all your shipping and storage requirements.