Popular seedling starting containers are peat pots, egg cartons, plug trays or milk cartons. Flexibles Packaging develops and supplies flexible packaging and specialty folding cartons. A packaging recipe addresses such things as containers, labels, corrugated cartons, and shrink-wrapping. Most people purchase milk in bags, plastic bottles, or plastic-coated paper cartons. This includes fast food wrappers, sandwich boxes and drink cartons. The company invented folded paper towels, cardboard egg cartons, and the window envelope. It may also include finished cans that are not yet packaged into cartons or pallets. Many types of cartons are used in packaging. Panels of bark can be fitted or sewn together to make cartons and boxes. Case picking is the gathering of full cartons or boxes of product. Most generally serve milk (in cartons or bottles) or other dairy related products. However, all brands are also now available in small cartons and large PET bottles. Ammunition was shipped in rectangular 10-shell fiberboard cartons. In Sweden, Tetra Pak launched tetrahedral paperboard cartons in 1952. Ammunition came packed in single-ply chipboard cartons lined with Manila paper.