Originally Posted by
madpogue
Looking at the far bottom right pic in that ^^^^^^ Ortlieb conversion doc, you could install it as a pannier, and carry a small child on the outside on the backpack straps. I wouldn't let Child Protective Services see it, however...

...
That makes for a great visual. : )
Originally Posted by
daoswald
I use a pair of Ortlieb Bike Shoppier panniers. My laptop goes into a neoprene sleeve first, though. The panniers are completely weatherproof, and work out quite well.
I have two of those and love them. I use them for camping and on days when rain is called for in the forecast. My laptop conversion bag will fit inside, when necessary.