Ship your own blend of coffee or give party favors for special events with 7Penn Sealable Treat Bags. 50-pack of 16oz herb bags are blank for you to attach your own label or design to give that extra flare so these work for home or business. Multi-layered design of plain coffee bags has an outer black matte film to improve texture and grade. Inner layer of PET plastic helps keep out odors and protects from outside debris during transportation. 0.8-inch one-way valve allows air to release without absorbing back into valved coffee bags. Sample sealed bags are easy to fill and after placing the items inside use a heat seal (not included) to secure the sealable popcorn bags top sealing strip. Zipper reclosure keeps things preserved after first use. Warning: This product can expose you to chemicals which is [are] known to the State of California to cause cancer and birth defects or other reproductive harm.