Ahh, I've never had one, but they're so aesthetically pleasing and I really want one in the future. The only problem for me is that they look really small so I'd personally wouldn't use one for school purposes, but I've seen people use them as school backpacks.
actually surprisingly they look small, but they can actually fit a lot. I saw a video on youtube about it ! Also I'm pretty sure you can get bigger sizes too !