I have a Yamaha XT225 that I use for hunting on logging roads. I carry my bow in some forks that I attached to the handle bars, or break it down into a case and attach it to the rack I put on it. A hard case would be nice in a spill but this is what I have now. I have not yet come up with something better for my bow; it is a recurve so PVC pipe won't work for me.
I did want to post another idea for you.
Something I have found real handy is a hauling rack over the rear wheel that is attached to the frame.
The rack I have is made by ProMotoBillet, they make them for a lot of bikes. You can google them if interested. I sometimes attach a plastic milk crate to the rack (with cable ties), which is handy for hauling things without having to tie everything down, like a day pack. I sometimes hook a bungie across the top of the crate but for short trips on better roads I don't bother. The crate keeps straps on the pack from dropping down into the wheel or spokes.
You can also put a lot of boned meat in game bags a milk crate and it is pretty secure, and then wear your pack on the way out.