Fanny packs or rolling backpack?

[G8RFAN]

That's insulated??? No way - and here I've been wasting that space all this time! Thanks!

I searched all over the internet to find a picture of one and the weird thing is I finally found a picture of one hosted by the County that I live in. Cheap but very effective. I must note that since we also use a stroller, we leave it with the stroller on rides that won't allow carryons.