If you have many luggage requirements, this ROCKBROS all-in-one rack Bag designed to securely carry your biking essentials during long time riding. It has several protective compartments for all your valuables, including two side compartments that extend for that extra space, should you need it. And for those rainy days, it comes with a reflective waterproof cover.

Extendable design for taking extra large items
Reflective straps on both sides for safe nighttime riding
Quickly mount it to your bike rack with four simple straps
Comes with moveable dividers to subdivide the interior of the bag as you need
Waterproof reflective rain cover for complete protection in wet weather
Rear Water bottle holder for longer endurance journeys
A strap on the back allows a clip-on tail light to be fitted easily
Top drawstring strap together with a mesh pocket for extra storage
Weight: 31oz (890g)
Size Closed (H x W x D): 8.6" x 4.5" x 12.6" (218 x 114 x 320 mm)
Size Open (H x W x D): 19.2" x 11.5 x 12.6" (487 x 292 x 320 mm)