|"There are plenty of eye-witness accounts. Just because you're so narrow-minded you need to have everything shoved under your nose before you–"
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A Collapsible Cauldron is a cauldron which is presumably capable of being folded for portability or easy storage. The cauldron shop in Diagon Alley, Potage's Cauldron Shop, carried this type of cauldron. Bruno Schmidt, a six-year-old boy from Germany, killed an Erkling with a collapsible cauldron belonging to his father, thereby saving his own life.