guzzi replied:

I have just bought an Ice mate in 25 ltr.
Ive yet to try it in anger.
However I have compared it to the 26ltr Coleman its replaceing, I put a frozen 3 liter milk bottle of water in each an closed the lid, both were sitting in the sun during the afternoon, colman lasted a day and a bit, ice mate lasted 2 and a bit.
Havent tried it properly packed but its better than the old coleman.
The lack of a across the top carry handle is a bit of an omission on the icemate, I plan on fixing that with some webbing.

Derek from Affordable Batteries & Radiators replied:

The Evakool range is great.

Have a look at their site.

Evakool

Regards Derek.

Robin replied:

Not many properly rated small ones around, as it takes more insulation thickness
to keep'em cold proportionally.

Coleman had an extreme 26lt one with proper 50mm insulation, but now smallest
fully rated unit I am aware of is Coleman 36lt extreme, its rated 5 days at 30c.

We use this as our smallest , and it certainly meets its specs. Design is such that
it's smaller and certainly lighter than you might think , somewhere around $129.

Robin Miller