Purist has created an innovative new lid for their reusable bottles that lets you sip your beverage from any angle. Rotating the outer ring lets you adjust the amount of flow from the bottle and it also seals off the top for a spill-proof lid when closed, a perfect solution for sipping piping hot drinks. Couple this with their durable glass-lined bottles and double-wall vacuum insulation and you've got the perfect reusable bottle. 

$38-$46, puristcollective.com