Find me a new bag, rescue me from Cath Kidston!

[Kludge]

I currently have an old spotty oilcloth Cath Kidston bag (I know, I know) that I really want to replace. I'd like something like this crumpler but a little smaller. It needs to be a hands-free bag as I have 2 young DCs to run around after.
My other go-to bag is this Kelly Moore but it's too big for everyday lugging about.
I like canvas but don't mind what it's made from as long as it's not twee like my current one