Way back in April of 2013, I purchased my perhaps most useful bag to date - the Louis Vuitton Neverfull. Settling for the medium size, I opted for the durable damier ebene canvas. This bag is a workhorse. I carry it to school, to work, for traveling - it's perfect for everything, incredibly chic, and super convenient. I love this bag so much that I want to purchase it in damier azur, as well. Bonus feature: it fits cats comfortably.
The huge shopping bag I got with the Neverfull: