I have used one of these for years.
Vacuum Insulated 10 oz Food Jar | ThermosŪ
Advantages
It's small enough to fit in your bag unlike the big tall ones with separate cup.
You just unscrew the lid and drink directly out of it.
If you wrap black pvc tape around it it's almost invisible tucked beside your blind. Having it outside your blind stops mess when you knock it over.
Stainless so it doesn't break.
I have two and take the second on particularly cold trips. I brought it from the warehouse, it wasn't the cheapest ($20) but unlike all the others I have brought it gets used instead of just sitting in the cupboard.
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