I've seen a rock used. Didn't turn out well.
Just unpacking... Chair, mat, rifle, 100 rounds ammo, backup rifle, 100 rounds ammo (cuz I AM going to shoot damn it,) food, water, Dt Pepsi, cooler, timer, pen, paper, notes from last time, electronic muffs, plugs (sometimes use both,) eye protection, hat, optics wipes, bug dope, sun screen, towel, cleaning rod, wipe out, grease, oil, sun glasses, butt wipes and TP, cell phone, cash, extra water, screw drivers, patches, altoids, jogging stroller, small back pack, business cards, rain gear, pop up sun canopy. Never have used the sun canopy, but it's in the back of the truck anyway.
Don't have a spotting scope, so I don't pack one. Maybe for my birthday.