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These are made from 5.5 ml thick polyethylene and have an industrial-strength bottom seal. Mineral explorers use them for storing and transporting rock or core samples. They can be closed with cable ties and written on with a marker.
Available in several sizes, the sample bags are sold in packs of 100 bags.
Made of strong and durable 4 mil low density polyethylene. These bags have a white rectangular block to write on. Ideal for collecting soil samples in the field. Sold by the case.