You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.

Category: SNACK BRANDS 
Clue: Each unit in this brand, introduced in 1968, is a hyperbolic paraboloid, & they fit together for perfect storage
pringles potato chips