2015 Rzr 900S Cargo Box

Does anyone know what the best Polaris cargo box that is out there. There are 2 that I am interested in ordering. I tried to submit a photo of them but I get an error message saying not a valid image. Not sure why. One is $299.00 Cdn and the other is like a cooler going for $495.00 Cdn.

My Rzr 800 had a box that had the quick rubber locks (not sure what you call them) on the inside and I found that whenever I removed the box and there was water in the bed box, the water entered the cargo box once I unlocked the rubber locks. I am hoping that there is a box that mounts from the outside.