I commutte with a 17" MBP. Currently I have to ways..either on my back with a pack, or i fit the pack in a rear basket and strap it down.
Now that I have a proper rear rack, i'd like to get a pannier that can securely hold it.
Either a pannier with a large enough space for it
or a pannier that contains some sort of compression straps (inside of it) where the mac can be stored (within a sleeve of course).
I did find an Arkel bag...but it's one sided....i'd like to find a double pannier...one on each side (i know, im being somewhat picky)
** edit **
The Toronto Bike Show will be on next week I believe. Would I be likely to find a pannier that fits my needs there?