I carved a notch in the bark with a broken spoon, then layered pine sap over it until it cured. When you press it, the sap hardens into a crude filter that blocks insects but lets air through. For traps, I take an old trekking pole, cut the tip, wrap it in duct tape, and wedge it into a hollow root. When a hiker bumps into it, the pole snaps back, sending a splinter straight up. It’s not pretty, but it works. If you ever need more bark, just find a tree with soft, peeling bark—those make the easiest layers. Remember, duct tape is the pinnacle of engineering.