i went with cargo box as well,,,i wanted also to keep it out of the mud,,,my Polaris's all had the starter relay exposed along with the Battery,and i thin it contributed to some issues they had
i have no problems with gettin things in,and out,i keep a tow strap,a mini tool kit that is in a pouch,,,anouther pouch with assorted nuts,and bolts,and yet anouther with a partial roll of electrical tape,3 feet of bailing wire,about a foot of plumbers tape (metal with holes in it),a small tooth brush style wire brush,and a few feet of 14ga insulated wire,,,,its crampt,and you pretty much have to pull everything out to get anything,but i think thats good,nothing bouncing around
i use the pouch that my goggles came in for the tool kit,,,it has a folding 3/8 ratchet,,,,i got a 3/8 to 1/4 drive tip so i could use all 1/4 drive sockets (much smaller,less room) both sae,and metric pretty complete set,,,,small cresent,,,,,stubby screw driver with the tips in the handle,small pliers,,,and one of those one socket fits all from Sears with all of the pins in it that conform to the nut when pushed over it