Hey guys. I've been looking for a good storage solution for my rear rack and this is what I came up with. It's this MTM O-ring sealed gear box bolted to my Immix rack. MTM Sportsmen's Plus Utility Dry Box (Orange, 18.5-Inch) https://www.amazon.com/dp/B0051F9BN6/ref=cm_sw_r_cp_apa_L5CsAbP3EQX92 What I like about it: -Lots of room- can fit my dji drone(large) or a bunch of gear. -Bright orange- a plus for me, I DO NOT want to get rear ended. -Mounted solid with 4 bolts and large fender washers but can be easily removed with my on board tool kit. -O-Ring sealed, very water tight. -It is "permanently" attached to the bike and is LOCKED= law enforcement must have "probable cause" or a warrant to open it. Also decent theft deterrent for a bike. -wind drag profile is smaller than my torso. I'm sure the box could be bolted to most flat rear racks. Whattya think?