vacuum(thermos)flasks

Terry, Aladdin also badged as Stanley (I think they were bought out) are an excellent thermos being very strong & keep their heat pretty well. They also have good parts availability for replacement lids & stoppers making them a lifetime investment.
I have both the Quart (for work) & half gallon (for camping)......really up to you depending on how many cups of coffee you drink.
Cheers Craig............

Sludgie there are significant differences in there performance , pretty sure I've tested many.

Like many things its hard to get standards based independant performance figures, and range and model variation changes constantly.

You probably know that stainless ones , are strongest and loose heat fastest.

Also in any same range of product the biggest holds heat longest as ratio of surface area to volumne drops.

There is an Aladdin in there range with packing stuff between the two stainless walls which prevents it from denting easily and also gives it acceptable performance, somewhere around $60, and it has a relative heat retention time of 24hrs (60c then). Good product.

I however have gone for heat performance and this means glass.

I use a $17 thermos branded chinese made unit of 1.8lt and it has a relative rating of 36hrs.

If your look into cheap shops you will see variations of this model and your can tell because they are labelled 1.8 lt, these are the best heat performing series around
and are often sub $10.

These glass ones break easily , however most of the reason for this is where the base screws on. It usually screws and makes contact at a few points to the glass.

A little bit of sticky velcro or similar here makes them much more resistant to breakage.

Robin Miller