Great for indoor and outdoor events like school functions, church events, birthdays, graduations, weddings and more. Constructed from strong, 200#, singlewall corrugated; Flaps self-lock on the bottom for quick and easy set-up; Hand holes make containers easier to carry and transport; Completely reusable, recyclable and disposable; Ships and stores flat to save space. Sold in a quantity of 20 per pack.