You all have obviously never been introduced to the Nissan Backpack Bottle.
http://www.amazon.com/dp/B000K604P0...e=asn&creative=380341&creativeASIN=B000K604P0
I make 2 at a time with one tea bag. I like my tea black and weak so I get 32 oz from one red rose tea bag.
UNOPENED, the bottles will keep tea scalding hot for 8 hours. hot enough to burn you.
If you are sipping from the bottle and reclosing it in between sips, it stays hot for 2-3 hours. It's safe to keep by your cards (leakproof) and will stay hot longer than any reading.
I take a bottle with me everywhere. When I shop for bags, I make sure it has a pocket for my bottle. I have let it bang around in a bag and it never leaked...but I prefer not to push my luck. For extra leakproof precaution, before placing in bag, release the cap and recover to relieve any pressure that may have built up and make sure NOT to overfill.
24/7 I have hot tea by my side. It really is a security blanket for me. Every once in awhile when sipping from my bottle, while acting anxious, someone will point out that maybe the tea is adding to my anxiety. I tend to growl and say, "believe me you do NOT want to see me without my baby bottle!"