MIK Big Poppa Trunk Bag is the XL of cargo storage. The MIK Big Poppa by BiKase is a powerful rack bag that unfolds as you need it. Compatible with MIK racks, it attaches securely and can be easily removed when needed. It features a large main compartment capable of holding ice while keeping the rest of the bag completely dry, and its drop-down pannier bags give you the extra space that all your essentials need. Main Compartment is expandable and with a water bottle pocket on the back, this bag gives you all the space that you might need. Its MIK quick attachment and release make attaching it to any back rack completely a breeze, and you can rest assured that it will travel safely. When you're done riding, it has a handle on top that can be used to carry it around, and when you are riding, the reflective straps (two on each pannier) keep you visible at all times. This heavy-duty, heavy-lifting bag has all your needs covered. MIK bike rack not included.