+1 for heavy fill. The super light beads don't do it for me. Heavy fill is more like moderately wet sand. Also second the minis over full size. I like the AG Game Changer more, but the Fortune Cookie is also nice to use. For a rear bag, their cylinder is nice, forget the name. Though I recently got one of the Taylor Was Here bags and like it much much more (hand strap, the ears, etc.)