I have a couple of backpacks. My recent favorite has been the Qwstion Simple Bag: http://www.qwstion.com/en/bags/simple-bag-washed-black.html http://www.qwstion

I have a couple of backpacks. My recent favorite has been the Qwstion Simple Bag: http://www.qwstion.com/en/bags/simple-bag-washed-black.html http://www.qwstion.com/en/bags/simple-bag-washed-black.html It is not fancy - just literally a bag with two almost stringy straps. No fancy compartments except a small pocket type thing inside and a small zip-up pocket outside. The straps also double as a drawstring to close it. I like it because it expands easily to fit everything I need - laptop + charger, synth, gym clothes, lunch, whatever. The strap is also attached in such a way as to let you easily switch carry mode - eg it can quickly go from a backpack to a tote bag.