Someone needs to help me here. What could be the reason that I would want to maintain a hot or cold temperature on an fluid for 8 or 36 hours? Coffee would be gone in a few hours at most. The only cold liquid that might survive 36 yours would be PGA. And if I got dropped naked into the middle of a jungle with nothing but this and an ESEE cleaver, there wouldn't be a place that I could get a refill in order to pour myself another hot, steaming cup of pig fat. If someone wants one of these, that's not really the issue. The issue is the idiot writing the advertising copy. I pick up a lavender, double insulated smaller bottle from HD that was $5.00, clearance. Hey, there was no S&H.