This is a great TOPEAK MTX black Trunkbag with integrated panniers. This is brand new, never used and never even installed onto the bike panniers before I sold the bike! 

The MTX TrunkBag is a large, weather resistant trunk bag full of features. In addition to the expandable top section and rear water bottle holder, the side panels expand to full panniers maximizing capacity. Compatible with all MTX QuickTrack® racks with attachable side frames. MTX Dual Side Frames are required when using panniers on MTX BeamRacks.

* 1 main zipped compartment and an additional zipped top compartment

* Two side pockets with expandable panniers

* L600 denier polyester

* Insulation is molded EVA foam

* Bag attachments - MTX QuickTrack® with attached side panels

* Water bottle holder, Shoulder strap

* Carrying handle, 3M™ reflective strip

* Safety light clip, Elastic top bungees

* Size 36 x 25 x 21.5-29 cm 

* Weight 1140 g 

I also have for sale the DEFENDER mud guard if you wish to take a look.

Thanks for looking!