Fluid's donut-shaped cup may be the first thing to catch your attention; although it entails a slight reduction in cleaning efficiency, it is truly ergonomic, achieving the benefit of twin handles with the cup surface itself. But it's the sippy spout that is an exercise in meticulous and high design. Although appearing to be made of a single piece of plastic, it is actually two parts, closely joined: a hard plastic outer shell with a gentle curve, and a softer plastic inner lining with a rubbery give that is sealed seamlessly into the shell.
This lining helps seal the connection between the lid and the cup without the use of a threaded screw (adhering with an unsatisfying smush, but clearly sealing tightly) but it also does all of the work: The outer surface parts at the top in a small, ovoid opening roughly the size and shape of a cat's pupil, but it forms a slight depression rather than a hole because the inner material underlays this opening in a thin, soft membrane with a tiny slit in it that allows liquid to pass through when suction is applied.
The cup has a moderate flow that invites a lot of heavy swigging, but the lusty head-tilting feels well-supported by its ease of handling. Fluid does not drip much when shaken upside down, but creative users can create a drip-drip-drip effect, which strikes us as a limitation, for sure, when dealing with kids at the "no means not while I'm looking" stage.
The Fluid is available in orange/off-white and pink/white.
Moderate 
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