Hey mang, I'm originally from Ohio and I used to go to all the same shit. Nelson's Ledges, all the way out to Bonaroo, lol. That's awesome. Anyway, here's a few things we used to do, and we never once got caught. You got the right idea with a vaccuum sealed bag. Then take a brand new jar of peanut butter, carefully remove the foil top, stuff the bag inside, smooth over the peanut butter, then reseal the foil top with super glue. Pack it in a cooler with some jelly, bread, chips, drinks, etc. and just keep it in the car. This part isn't for the faint of heart, but I used to do this with my car. Take a bunch of glass (not bottles) and smash them up inside a bag. I'm talking like down to just basically glitter. Then on the floor board where you are going to have the cooler, just sprinkle the glass around the cooler and on that part of the carpet. The dog, if you were that unlucky, would get into the car, start smelling around and once he hit that area, he would get a nice breath of glass glitter in his nose. At this point, packing the bud in the peanut butter was just a precaution. Happy growing and safe travels mang.