looking for a cool back pack

[Floellabenjamin]

as in chiller cool.
I have a large shoulder cool bag to take to the beach/days out that we use to put our lunch and snacks for family of 5. but it's not that practical to carry as it gets so heavy and I was trying to find something similar to wear on my back. I don't need all the picnic plates and knives etc. but would it to be semi stylish-the ones I have seen are all bottle green.
any thoughts?