Small Cooler Lunch Box

Who can recommend a great cooler lunch box that isn't too big and works well without wetting everything else in the bag? I know lots of cooler bags that make everything damp and I want to put it in ds's little back pack with spare clothes, toys etc so it has to work properly! I'm looking at Fridge-to-go and the size is great, only 18.5W x 8D x 19.5H (cm) (internal measurement) which is reasonable size without taking up all the room in his bag. It's a bit pricey but I'm happy to pay for something that is going to keep his bag dry, his food cool and is good quality and small in size. TIA

I had a Nudie for DD, but found them too fiddly in the end and the ice brick goes inside the box, not cool.
So I bought her a Decor one. It is in a box in a n insulated bag, but he flat ice brick goes in the inside of the BAG lid, outside the box, so won't make anything soggy.
It is a great size and has some little containers in it that she can open with no problems at all. Was $15 I think from Woollies.

I just bought DS a Tupperware cooler bag that came with a sandwich keeper. I like it because the sandwich keeper will keep the bread getting wet if I were to put a frozen popper or something in and the bag is made so that the dampness doesn't come through to the outside. It was $29.95 for both. They have it currently in green and yellow I think they were..

Oh and I forgot to add its made for kids bags so is smaller than usual cooler bags.