You can get quite good air of a binbag, check attachments for video, though once i was going at top speed wheelie'd up to it and got on cj's garage, so you can get much better height than is in this video, what you do is, go to it on a BF, PCJ, Quad or Nrg, for everything excluding the quad, go up to it and wheelie, you ashould get good air, for quad, keep pressing lean forward when you go towards it, keep holding, and just when the front wheels touch the bag wheelie