Canned Air (5e Equipment)
From D&D Wiki
Found among the ruins of a former Gnome settlement, these little bronze canisters hold small air elementals. When the release valve on the base of the can is turned, the trapped elemental escapes with a forceful burst.
The canister can be fixed to an arrow, bolt, dart or javelin. When the ammunition or weapon is used to make a ranged attack, the range is doubled and on a hit the target takes an additional 1d6 piercing damage.
Once a canned air has been used, the elemental disperses and the canister becomes a small nonmagical container.