Anybody else have a problem with a trunk bag listing to one side? Mine's a Nashbar bag, with four hook-and-loop straps to attach it to the rack. No matter how tightly I cinch the straps, and no matter what kind of load I'm carrying (and how it's distributed among the main compartment and external pockets), it sags off to the right side.

My Avenir bag does it, so does my Banjo Brothers bag, so does the Trek bag. Seems to be the nature of the beast,

Seems they all do.

Use some coroplast (sp?), corrugated plastc, the stuff used to make election signs etc. to use as means to stiffen the sides of your bag. I cut a sign up and lined the inside of my Nashbar bag w/ em and now have a more rigid bag.

Craig

i have b-nash bag as well and noticed the same.
keeping it filled seems to work best to prevent left/right sag!

So far my Arkel trunk bag fits nice and snug and does not sag. I should note that only have about 400 miles with it so things may change with time and miles and wear and tear.

Best Wishes
Green Bear

Mine is a Banjo Bros and same problem, I used a small bunji cord and hooked to the left front of the bag (there is a strap around the front of the bag) around the seatpost and to the right front of the bag and it sits straight now...

I have 1993/94 version Nashbar Trunk bag. It has plastic/nylon tub built into it.
Never sags I always wondered why they quit making them with tubs.
Progress?

I'm in the saggy bag crowd
it really pisses me off too, I just make a wire fram for the inside of mine

No sag here. I have the Trek Interchange DeLux Trunk with a seperate Interchange rack on my 930 and 520. Not suitable for serious touring but excellent for commuting or long day trips. Just click-n-go. Normally, I have the trunk full of the usual What-If stuff, plus lunch. The right pannier rarely gets used unless I go for a long trip and the weather is iffy. Even with the left pannier full, there is no sag. I think the connection is: Buy a lightweight bag, get the sag. Or, don't be a weight weenie, get the tool that'll do the job.

Actually, the one brand of trunk bags I have found that don't sag are the Topeak ones. I think it has to do with the very solid plastic extrusion on the bottom that slides on the to alloy extrusion on their racks. The outer casing of the trunk is attached firmly to that, and the sides have closed-cell foam as additional support in the sides.

A friend had a trunk bag similar to the ones discussed here, a Nashbar one. The Corflute/Coroplast solution worked well, but!... in the bottom. I actually used the side of a plastic 3-litre milk jug. It was a tight fit in double layer bottom (I had to slit a hole in the front to slide it in). I didn't fit any side support. The bottom piece of plastic has worked very well. I think that if you just fit a piece of Corflute/Coroplast in the bottom without slipping into the fabric envelope as a tight fit, you need to used short bolts, washers and screws at either end and at the middle to attach the lot together; this stabilises the fabric the same as the envelope or pocket would.

As far as I can tell, you can cinch down the bags tight on the rack, but if there is not a solid base, the fabric will always allow the bag to sway around.

My friend has reported no problems whatsoever since I did the job.

I hang my lock off the left side of my nashbar trunk, solves the problem