3 mil thick polyethylene mushroom log bag measuring 9" x 5" x 29" with gusseted sides. Non-autoclavable. These straw log bags have pre-punched 0.25" holes, eliminating the hassle of punching your own holes. The bag is sealed on one end, and open on the other which is designed to be tied off after stuffing with substrate. These are designed for pasteurized substrates, such as straw. Most commonly used for making straw logs for growing oyster mushrooms. This will make a 8.5" diameter log.