i adore my longchamp pliage bags and i use them for just about everything imaginable. In college, I use it when I dont feel like lugging my messenger bag or bookbag, plus its a cute purse without having to worry about it getting dirty, spilling, etc. (i am use to having to be paranoid about damage to LV vachetta)
Another great use for them is for putting your shampoo/cond. and other liquids in while traveling because if they do spill, you can just rinse out the bag, lol
i also love that they are chic and affordable, i see women carry them who also carry much more expensive bags so it's not like they are labeled as the cheap designer bag or anything, they have a great amount of class to them