Polyethylene or polypropylene bags are characterized by high lightness and low cost. They are used to contain finds of various kinds including rocks, minerals, fossils, shells, museum samples, objects in general, books, equipment, clothing, and an infinite variety of objects that need to be preserved and protected from dust and from time. They can also be used to contain components and more such as electronic components, plant seeds, and more, clothing, etc. Plastic bags for minerals, fossils, shells, objects, toys, favors, coins, archeology, insects, geology , old books, etc...