Lunchbox backpack? Anyone seen one?

[KatamariDamacy]

I’m hunting everywhere for an insulated lunchbox-type bag that can be worn as a backpack. And I’m finding it surprisingly hard. It’s for 5yo DS - he has SEN and wouldn’t manage a shoulder bag, and he doesn’t need a big adult-sized one. But I’d like it to be insulated to keep stuff cooler. Not a lot to ask, surely?

But so far I’ve drawn a blank in Sainsbury’s, Asda, Argos and Amazon. DD has one but it’s very sparkly and he won’t wear it. If anyone has seen one, or is better at tracking stuff down than me, I’d be really grateful.

I brought one for my DD from Cath Kidston. It's not a full insulated backpack but it has quite a large section at the bottom. I'll see if I can find a link

Could you put his insulated lunch box in a small backpack or draw string bag?

What about this:

IGNPION Nursery Kids Backpacks Toddle Children School Bag Zoo Lunch Bag 3D Cute Animal Cartoon Preschool Rucksack (1-5 Years Old) (Puppy) https://www.amazon.co.uk/dp/B01N5RFJTC/ref=cmswwrcppapiii_R-p-CbHWW83HR

Or this

Thermos Kids Lunch Kit, Football https://www.amazon.co.uk/dp/B00M2O31X0/ref=cmswwrcppapiii_Daq-Cb9TH9DX8

I couldn't find the Cath Kidston one but I found this trunki one at Amazon - https://www.amazon.co.uk/dp/B01MQTB4BC/ref=cmswwrcppapiii_P9p-CbHDGSKJJ