Which rucksack should I buy?

I've developed a need for a backpack, and oddly enough don't have one. I immediately thought of ASOS, as although I don't buy loads from there, I know I like their search functions. Here are the backpacks that have first caught my eye!

I'm not usually a fan of pastels on me, but this French Connection bag caught my eye.

This Aldo bag is half price, but I can't decide if it will look too shiny in the flesh.

This one perhaps looks more matte?

This one is rather practical looking, lots of space I guess.