The Rock Bros seems to be a copy of the Topeak rack trunk that has been around for awhile. I bought one this year to replace an similar style axiom bag that was falling apart after a year. I got their strap version as opposed to the quick release for their racks. Fits very well on the CCX rack, but I did have to add something to keep the bag from sitting too forward on the rack which introduces heel strike with the panniers & gets in the way of the suspension seatpost. I would've been fine with a regular rack trunk & pannier bags, but the old Arkel bags I have aren't able to sit far back enough on the Juice rack so I get heel strike. This rack trunk/integrated pannier bag is an ok compromise.
If anyone does get the Topeak bag. The panniers don't have a hook only a bungee loop & there is nothing for it to hook onto with the Juice rack. My solution was it attach carabiners to the to the loop & clip that to the rack stays.
If anyone does get the Topeak bag. The panniers don't have a hook only a bungee loop & there is nothing for it to hook onto with the Juice rack. My solution was it attach carabiners to the to the loop & clip that to the rack stays.