People find out the wrong way that their travel mugs are not spill-proof. Most of them are not, but should give you time enough to put them right-side-up if they tip. Well, here's one that actually is spill-proof; in fact you can clip it to the outside of your bag with the included quick-release carabiner clip, and let it take all the abuse you can dish out.

This is a very rugged mug. A turn of the recessed locking lid, and you are ready to sip. Lock it back in place and you are ready for spill-proof travel. The handle is a bit odd looking but very ergonomic with a silicone rubber grip. It will fit most car cup holders, and has a large 14 ounce capacity.

It has great heat retention in the locked position: 209 f water was 178 after one hour, 152 after 2 hours -which is still very, very hot! Height 7.25", widest diameter about 3.25" not including handle. 2.75" diameter at the base.