The minimalist aesthetic is a well known design approach. It works for lots of gear, especially functional things. It’s difficult to think of a simple, more functional item than a water/liquid container. Montbell's Stainless Themo Bottle has clean lines, is made from stainless steel with a few added features like a protective rubber gripper on the bottom and “easy-to-drink edges.” It holds 0.35 litres of liquid and weighs 125g (9 oz). Simple, neat and effective.