http://www.amazon.com/Topeak-MTX-Tru.../dp/B000FIAU0W

I use the Topeak trunk bag with panniers. The panniers are somewhat flimsy; so, i use neoprene sleeves for my2 computers. I put one in each pannier. I already had a rack; so, I got the universal bag that doesn't require the Topeak rack. It is easy to remove from the bike and carry into the office except it is heavy with 2 computers.