Here's Acme's most popular design: the elegantly curved Classical Klein Bottle.

The smooth curves of an Acme Classical Klein Bottle create an extremely low coefficient of aerodynamic drag -- they work in most common fluids including air, deionized water, carbon dioxide, and high-fructose corn syrup.

Acme's Classical Klein Bottles are made of real glass and come in three sizes -- Big, Medium, and Baby. All are topologically identical, and each is handcrafted of clear borosilicate glass for your manifold enjoyment.