The MTX TrunkBag DX Rear Rack Bag clips into place in seconds and provides expansive carrying capacity for everything you need on your next bike ride. Fitted with the MTX QuickTrack system from Topeak, this bag attaches to your rear bike rack with ease so you can set out on your adventure with no hassle, whether its a scenic trail ride or your morning commute. The TrunkBag DX uses a combination of rigid panels and stretchable fabric to give the bike bag enough structure to protect small electronics or food items while still repelling water to keep your cargo safe.QuickTrack System. The MTX TrunkBag DX is compatible with Topeak's QuickTrack System so it can be mounted on a Topeak rear bike rack within seconds. All you have to do to attach the bag is slide it forward until it locks into place. To remove it again, just press the release button. Stop spending time fiddling with cords and complicated attachments and start riding.Ample Compartments. The TrunkBag DX features a divided main compartment so even more delicate items such as a digital camera can be transported without getting scratched or damaged by leaks or food spills. The two mesh side compartments and rear water bottle holder mean you can carry multiple bottles for extended hydration on longer bike trips. EVA foam insulation will keep your water cool and refreshing in the heat. The multi-expanding top adjusts to accommodate larger loads and collapses conveniently when you don't need the extra space. Safety Features. The TrunkBag DX has a 3M reflective strip and a clip for a safety light so you can be visible to drivers and other bikers when riding at night.