Any recommendation on a good diaper bags and what to look out for when choosing one?

I bought jujube BFF.. Used it for 2 early. After the rough handling.. It is still in very good condition .. The lining inside is still perfect. It's not exactly the lightest. But what I like is that it can be a backpack or a side sling. I must admit it was rather expensive! But I am glad if latest me that long. Some bags, the inside become frayed etc.. But this Jujube was one of my best investment.. ;)