Thanks for the advice. I'll do that before I arrive this weekend. I usually don't keep my 257 very full, but with school picking up the intensity, I had a lot of stuff with me today. Here's today's carry for people still unsure about what size they should get: -13" Macbook Pro in sleeve (plus charger) -Large hardcover accounting textbook -Medium softcover english textbook -Coil Notebook -Two paperback novels -Water -Sunscreen -Bike repair tools (Extra tube, pump, tire levers, allenkey set, screwdriver, bike light) -Pens/pencils/eraser -Calculator -Sunglasses -Snack I could probably squeeze in one more notebook and other small odds and ends, but it's pretty full. It was an exceptionally heavy load to carry on my bike, should have switched to my larger backpack. Anyway, hope that post helps anyone who's still not sure about whether to get a 256 or 257.