Cool bags for oval picnic baskets

[Lmccrean]

Ive been given a smallish oval picnic basket - highly impactical really, but would be a shame not to try to use it. Anyone know of any very flexible coolbags I could get that I could fit into it and then fill with the sandwiches etc? I can only find the more rigid square ones. The one im looking for should be like a plastic bag with coolbag inner.

Woolies do them, trouble is all the winter stuff is coming into the shops now, you could try lakeland or the great little trading company.