The classic Klean Kanteen's simple design does the job. Stainless steel with a small enough footprint to stand tall in most cupholders, the Kanteen's screw-top lid is easy to open and its sports top functions as expected. The possible squeaking of steel on steel of the loop or flat cap may bother some, and the sport cap is a good alternative which also keeps ice inside when drinking iced drinks.
The Klean Kanteen can and does dent when dropped, but dents are minor and only add to its character. The lid and neck are extremely durable. This water bottle is a tank.
The 12-ounce version is also sold with an adapter and Avent sippy spout, and Klean Kanteens are sold in a variety of powder-coated colors with the loop cap or in the sippy format.