It looks like Bubble Wrap, but BlastWrap isn't for cushioning eBay shipments. A BlastWrap-lined garbage can will dissipate a backpack-size-bomb blast in less than one thousandth of a second. The wrap's 2.75-inch compartments are stuffed with heat-treated perlite (the foamy pellets found in potting soil), a volcanic glass. The beads have a strong internal structure of sealed, air-filled cells. When a blast occurs, the cells are crushed one by one, minimizing damage to the surrounding area, while fire extinguishants snuff the fireball.