I have no idea what fits on a Sportsman 90, what does your dad have? We bought one of those large plastic totes from Wal-Mart, it has wheels on one side so it's easy to move...we put most our camping stuff in there, makes it easier to haul around and easier to attach to the rack of the fourwheeler. We put the cooler on the front and the big tote on the back (all strapped down), balances pretty well. But the warnings about loading down your fourwheeler and the different feel of it is good for you to know! Just some of the things I don't think were mentioned:

-hot dog roasting sticks (or marshmellows), we bring brats and stuff so you don't have to bring much cooking gear.
-pillows
-lots of extra bags (like grocery sacks), for wet stuff, garbage, etc.
-air mattress & pump (for weenies like me)
-flashlight!

man, I could go on and on, just remember not to go overboard packing. We get out of hand sometimes just to be comfortable. Take just what you need! I make a list so I don't forget anything.

Have FUN!! Just when it looked like great camping weather...70-87 degrees the last couple days...today it was 30* with rain, sleet, hail and snow [img]i/expressions/face-icon-small-disgusted.gif[/img]