Which bag works best for carrying both a CPap and a Macbook Pro 13? I've looked at the Smart Alec and Brain Bag and am a bit confused? Does the Brain Bag fit under your seat in the plane or is it too big? I have a lot to carry but don't want it to be so heavy I can't handle it. And I saw a post that made it look like you could fit the copilot in the Smart Alec? Is that true...could I put Cpap in Smart Alec and copilot in there too? Thanks.