I bring my laptop, books, my water bottle with me to school everyday (grad student) and I'm 24 weeks pregnant and the backpack isn't working anymore -- too much strain on my back now. I think a big purse or side bag would also be an issue, as that's a lot of weight for one shoulder. What do you ladies use?? I'm scouring Amazon for different types of rolling bags right now, as I think that might be the way to go, but I'm looking for any and all suggestions!!