I hate designer bags. Those things look like ass to me and everyone pays out the nose for them. I'll never get it. Seriously, thousands of dollars for what looks like something a blind monkey did to a can of alphabet soup. WTF?
Anyway... I hate bags in general. The only bag I'll use is my backpack, which I take with me to work every day. It's got everything I need for a trip to work - PSP, notebooks for novel work and poetry, books I'm reading/studying, my CD player, CD wallet, headphones, lunch bag thing... it's great! All other bags are completely inferior, IMO. They either look stupid or don't have enough space. The only thing I used the backpack for is work, though. Can't imagine needing that much space for anything else. Anywhere else I go I just take keys, wallet, little black book + work badge + lighter (just out of habit).