Step 1: Ingredients
1 UPPTÄCKA briefcase
1 standard wire coathanger
Mounting hardware: (see step 3 for images)
2 mounting machine screws or bolts around 3/4 inch long and about 3/8ths thick, with nuts
4 lock washers - preferably the spiny kind that grip into whatever the bolt is compressing
4 large fender washers
2 nylon spacers, about the thickness of your coathanger wire (you could probably substitute a stack of small metal washers instead)
Big pliers for bending coathanger
screwdriver, for tightening mounting bolts
Step 2: Transform a clotheshanger into pannier mounts
Start out by unwinding your coathanger, and cutting it in half. Take one end of a piece and place it through something towards the rear of the rack - a hole preferably - and then begin winding the wire around the side of your rack. Take a few turns for strength.
Next bend the wire so that it extends outward from the rack - perpendicular to the vertical plane of the bike - about 1/4 inch. This will provide room for the mounting bolt head on your suitcase to slip between the rack frame and the mounting wire. Now bend towards the top of your U, and give at least 3/4 inches for space. Create your U shaped depression. The deeper the U, the harder it will be for your briefcase to bounce out of the mount.
Repeat the same thing for the front mount.