Which set is this bag 3 from?
THe appearance of  part 973pb2859c01 - Torso Scuba Vest with Utility Belt with Pouches and Lavender Tentacles Pattern / Yellow Arms / Black Hands means this is from one of these 3 The Lego Ninjago Movie sets.

The dominance of Red and Black bricks, combined with the presence of part 78c02 - Flat Silver Hose, Ribbed 7mm D. 2L narrows it down to set 70615 - Fire Mech.