Same box I have but I have the spoiler tailight instead of a rack, just a word of warning mine started cracking in the base but all good now reinforced it. What I am trying to say is the material is a bit thin so makesure either you don't put to much weight in or reinforce all the mounting points, otherwise a great box I love mine
I picked up a cheap bag on ebay yesterday nothing fancy but big enough to carry all my gear has 4 occy straps hidden in side pockets to secure to rack and can fit a full face helmet inside.
$50 from brisbane
Says shower proof so i would think any contents would need to be put in plastic if its pissing down