A Hydro Flask bottle—of any kind—is reliable. This insulated, double-walled stainless steel water bottle has a powder-coated exterior (a permanent, lightly textured coating) and a plastic cap.

In T3’s FLSK stainless steel drinking bottle review, I put this stylish water bottle to the test to see if its thermal technology lived up to the hype. FLSK is a German brand that designs and ...