I'm looking at buying a new Chrome bag to commute to class from my apartment. I have no car on campus so my bike is pretty much the only way I have to get from place to place.
Could someone who has used one of these bags recommend one size or the other? I'm going to primarily be carrying books and a small laptop to and from class, but I do make the occasional trip to the supermarket.
Sorry if this has been asked before, it's 9 in the morning and I'm far too lazy to use the search feature.