Seat post rack

[CyclingLeft]

My Trek 6000 mountain bike has disc brakes and does not have brake
bosses so I don't think a Cold Springs rear rack will work.  I have
looked on BikeNashbar and REI sites and it appears that Topeak and
Delta make a seat post rack.  Can anyone give me a recommendation
on a seat post rack?  Is there one that will support the weight of a rear
panniers and about 20 pounds?  I use the bike to commute to work
(too many unfilled potholes and cracks in L.A.) so I'm not interested in
a trailer.  I currently use a backpack to carry my stuff.

And, I apologize if this has been discussed to death, but I have been
unable to find any post of relevance using the search function.

[WesternFlyer]

Topeak has the MTX rack system in three styles that puts the rack a different heights depending on the size and design of the bike.   My wife has the V style (The rack drops down.) for her mountain bike.  It is the slickest design with built in rubber tie-down straps and a very secure, easy to use trunk system.  Her trunk bag came with zip-out flaps that become small panniers.  Somebody should get an A+ in AutoCAD design for this system.  It is load rated at 20 lbs.  And her front Ortlieb panniers clip on easily

I had the Trek seat post rack on my mountain bike.  It is stronger than the Topeak, but only comes with the rack being straight off the seat post.  I had the deluxe Trek Interchange trunk bag to go with it, which has some interesting features and compartments.  It has a very simple clip on system that wasnt very secure.  Jumping a curb or riding on some rough road would cause it to pop off with no warning.  And it leaked badly in the rain.  I wouldnt recommend the system.


Western Flyer

A wheel spins in a circle.
The still point at the center
gives it direction.
Be still.

   "The Parents' Tao Te Ching"