Several years ago, British industrial designer Jake Naish designed this Forss bottle. The brilliant concept was that the interchangeable sections provide a thermos that you can easily clean, and adjust the volume of.
Alas, it remained just a concept. But now an Oregon-based startup called Eureka is bringing a similar design to market.
The Eureka Bottle consists of a base—tapered to fit in an automotive cupholder–and two different Boost sections, one with a handle, one without. 
You can thus carry 20, 40 or 60 oz with you.
The sections are made of stainless steel, with silicone sealing rings, and you can easily disassemble the sections for cleaning.
The three-piece set runs $56 on Kickstarter, where it’s been successfully funded with 13 days left to pledge at press time.
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The designer of the product says that they have “over 25 years of industrial design experience,” but they don’t provide their name; I was hoping it was Naish, but he’s too young to have been in the game that long.