Java Needs a New Thermos

Well, Java’s thermos (a big 1L stainless steel thermos) needs to be replaced. The black plastic lid is warped and doesn’t seal properly anymore (or it screws in off kilter and then is nearly impossible to remove). Unfortunately, I’m having no luck finding anything big enough that doesn’t have multiple reviews saying it leaks.

Requirements for a pony-friendly thermos are:
-minimum 1L capacity
-leakproof
-stainless steel/metal (he likes to “help” pour his tea so it needs to be able to withstand pony teeth and getting dropped on the concrete without shattering/cracking. denting/scratcing is fine, haha)
-must keep tea hot for a minimum of 1 hour – the barn is a 45 minute drive away from my house
-small-hand-friendly cap – the one on his old thermos is a bit big for my small hands and so when it was working properly, I still had difficulties opening it because the cap was too big to grip effectively

Doesn’t need a cup or handle, just a leakproof inner cap (though I think ALL thermoses come with the cup cap?)

Thanks for any input! Java will be happy to have a thermos again!