probably wood or pipeing *edit* inflatable bunkers. http://www.actionvillage.com/AVI-Paintball/paintball-field-gear-sup-air-ball-sup-air-ball-field-packages . just wish i had some money and i would build one in my back yard Tires, Wood planks, Grades, Pipes, Trenches, etc. Old pieces of carpet nailed to trees are great. Also, think about digging foxholes or a large trench down the middle of the field.
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