I have a qt thermos brand I bought in 1975, I have used it ever since. It has a dent from when I drove away with it on the roof of my car but it still keeps my coffee hot. I wish I knew if the new ones are as good, I doubt it because I have to buy a pint size since the camo pint stainless I bought from Cabelas isn't worth spit. Fill it at 4am and by 10am the coffee is warm. The problem with the qt thermos I have is the weight, both empty and full in my back pack.