Which bag should I get?

I want to go to Deena & Ozzy Transformer backpack bucket bag, because you can use for a larger selection of clothes. Moreover, it seems that something more sophisticated person would have.The Ecot backpack Army base is very relaxed and seems very cool, but you feel like you should be very relaxed and informal setting. It looks a little something that someone 'younger, and as part of the whole look would be natural. Hope this helps.