Instructables
Ikea's UPPTÄCKA briefcase retails for $19.99. This instructable shows how to make a detachable bicycle mount for it with a few bolts and washers and a coathanger. You can hang your briefcase on your bike's rear rack while you ride, and pop it off and go once you arrive.
 
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Step 1: Ingredients

Parts:
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)

Tools: 
Big pliers for bending coathanger
a drill
screwdriver, for tightening mounting bolts

Step 2: Transform a clotheshanger into pannier mounts

A standard stiff wire coathanger will do. You're going to use it to create mounts on your bike's rear rack. For this you will need some big pliers - channel locks and a pair of normal ones in concert will do. Some heavy wirecutters are nice as well.

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.
Have you tried orienting the bags the other way, so that the long edge follows the seat stays? I think it would look better though it might not change the performance of them or balance of them in any detectable way.
lightnin9 (author)  Yard Sale Dale2 years ago
Yes - a good thought, and one worth trying out. In fact it might make weight distribution a little better. In the current configuration I can definitely feel a difference when turning -- it's significant, but not so bad that it's hard to compensate for. Positioning the bag lengthwise would get the center of gravity closer to the axle, so it would probably help with that. The thing is, the bag is set up to open horizontally, with internal straps that keep the contents from dumping out, so it's easier to get stuff in and out of it while mounted in a relatively horizontal position.
Hey Lightnin9,

That looks great !

Another option for someone not as skilled as you in coathangery is to use pannier hooks (ebay £6 )


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Great idea. I've seen some DIY pages where people just made long (several inches) hooks from flat metal stock, rounded the ends to prevent snagging other items, and bolted them to bags or cannisters.
lightnin9 (author)  FriendOfHumanity2 years ago
Woah, awesome! I had no idea such a thing existed. (Might not look quite as nice on the bag, but that doesn't matter so much. This would make installation easier.
Thanks for the tip!
great idea, love re purposing even the new. water is a concern but nothing a spray for the day or clear coating wouldnt solve.
lightnin9 (author)  HeWantsRevenge2 years ago
Actually it seems to be pretty waterproof - at least when it's been rained on. I'll report again the next time I ride through a deluge. (I think that underneath the fiber looking exterior, there's a hard, non porous plastic shell).
Looks like a big Lego - that's awesome!