Commuting - Epic Rear Trunk Bag Sag

Anyone experienced the trunk bag sag? I have the Performance Transit Rear Trunk bag and it is perfect for my 34 mile round trip commute. It has about 14 liters of maximum space which is enough for my commuting. I remove the bag at work and take into the office and it is very efficient. The problem is that it sags to the left when on the bike. It doesn't cause any riding problems, but it looks deformed. I think there is foam in the bag to help it form a box on the rack, but it always sags. I have tried to straighten with no luck. I am thinking of switching to a Carradice Nelson saddlebag or SQR. Any suggestions or experience with any of these bags. Thanks

I had that same problem with mine and fixed it this weekend.... I bought and installed the Performance Trans-it rack.

The problem for me was that my old rack was narrower than the velcro straps on the bag. My Cannondale rack was too skinny for the bag to sit properly and the bag flopped over to the left too. I put the Trans-It rack on the bike and it sits correctly now. The racks are on sale now too.. I paid $19 and change for it.

I was able to figure it out because I have a similar bag on our tandem that sits like it should. I took my commuting trunk bag and put it on the tandem, and presto.. it sat up right. Common denominator, was the rack width.

Your mileage may vary, but that was my experience.
Don

Thanks Don, I am glad it worked for you, but I have the transit rack. I bought the rack and trunk bag as a combo package. I think it might be the nature of trunk bags. If you fill them to the top, there is a tendency to sag to one side or the other (gravity and the lean of the bike). Seems like a plastic insert is needed to keep the bag in a firm upright position.

There is a corrugated plastic that some sign shops use that can be of assistance. It can be cut to the right size and folded around the inside perimeter of the bag, making for a soft skeleton that will, ahem, keep it erect.

I solved my problem. I took a 6 inch mini-bungie from another small bag I had and hooked it from eyelets on the top (front corners) of the trunk bag around the seatpost. It provides enough tension to pull the bag slightly forward and keep it perfectly upright. I tested it with a half and full load leaning the bike all the way to the ground.