bubblewrap

/B AH1 B L R AE1 P/
noun
  1. 1

    Cushioning material consisting of small spheres of air trapped in plastic, sold on long rolls for tearing off, and used as packaging for fragile items.

Source: https://en.wiktionary.org/wiki/bubble%20wrap, https://en.wiktionary.org/wiki/bubblewrap