I just wanted to throw this into the conversation - My wife and my son both use French Presses for Coffee. There is an insulating wrap that is made for an "As Seen on TV" 'noodle cooker' that fits our 32 oz. French Presses perfectly! You can see pix of it here
(old website link - click on the "proceed to destination link") and here
So far, she has found three of the wraps in the thrift store for about $.25 each, one w/ noodle cooker
- they originally cost about $20.00 new!. The wraps are Royal Blue and have velcro to hold them in place. We both have a 4 cup size French Press. My son hasn't been able to find any wraps in the thrift stores where he lives in Tennessee, but they seem to be plentiful here in Montana.
Since I am interested in learning to homebrew (the wife makes our wine), I'll be getting a French Press soon. I'll be making my beer in my van as I travel around for work. Hmmmmmm ..... I wonder if a Primary and/or Secondary 1 gallon jug with an airlock can be considered an open container