Our lay flat poly bags are the most popular type of plastic bags for packaging. These bags are 1.25 mil thick, and are manufactured with an extra strong bottom seal. Almost every type of industry makes use of flat poly bags in one form or another, including agriculture, commerce, baking, landscaping, hospital work, clean room technologies, electronics manufacturing, computer software shipping, mail order businesses, companies, and many others. These flat poly bags must be heat sealed, taped or twist tied for closure.