This is what I have for my MacBook. This case is amazing and what's cool is you can work right out of it. There's a pouch in the back that would also fit an iPad with its own case. The quality is also very very good. Well worth the money and you may even be able to find it cheaper.
Always use my Timbuk2 laptop commuter bag, think it's a medium. mac in the laptop pocket, ipad slid between laptop pocket and a binder or folder so it was cushioned on one side.
Just picked up one of the updated 2012 models and they actually added a dedicated iPad (or other tablet) compartment within the padded laptop compartment.
MBP 2011
ASUS Zenbook UX21E
iPad2 (soon to be new iPad)
Chargers for laptops
Beats By Dres Solo
Grid It organiser (holds cables and batterys for charging phones on the go.
Kindle
Pen
Notebook (paper version)
and a bunch of other things.