https://www.amazon.co.uk/Wenger-600631-Backpack-friendly-stabalising/dp/B002V9R1NM/ref=sr_1_1?ie=UTF8&qid=1465263681&sr=8-1&keywords=wenger+laptop+backpack
I use this one, it's got LOADS of room and plenty of pockets and compartments to keep all your bits and bobs in.
(It's also made by the company that makes swiss army knives)