This is my current thermos:

https://www.amazon.com/gp/aw/d/B00HYOGUM2/ref=psdcmw_602608_t1_B074L2PBY9

Also just picked up a S'well thermos, a bit pricey @$35, but has many fans. Too soon for a review on this product.

Had a Nissan 20oz thermos that lasted for years until someone stole it at work.

Just do some homework and read the reviews before buying. Lot of good options out there for hot and cold drinks and has the right dimensions for bike use.