Klein Tools' New Stand-Up Zipper Bags Will Keep Your Pieces and Parts Organized. The Body Of This Tough Pair Is Made Of Coated 1680D Ballistic Material While The Bottoms Are Reinforced With 2520D Ballistic Material. The Gusseting On These Bags Keeps Them Standing Up Making It Easy to Find Your Hex Keys, Small Levels, Drill Bits, and Pieces.