Genuine G.I 3 Piece 1 qt. Canteen with Clip is made of a high-density polyethylene plastic that is BPA Free, with a rigid, single wall construction. The military canteen features a screw cap and clip and will fit into any our G.I Style Canteen Covers. U.S. Made, NSN# 8465-00-889-3744 MIL SPEC: MIL-C-43103