The Spore Spreader™ is cylindrical, like a bucket. The perimeter of the bottom has a 3/16” flexible plastic ring sewn into it to help keep the bottom flat and to help distribute the weight evenly on the bottom to minimize crushing. There are fewer crumbs with the Spore Spreader™ because the mushrooms aren’t grated as much as in a conventional sack. The plastic ring also acts as a bumper to absorb the shock of bumping against trees, the user’s hip, etc. The bottom itself is solid cloth and the sides are mesh. The spores, debris, and insects can still escape through the mesh sides. And, when you set the Spore Spreader™ down in the woods, the solid cloth bottom will keep your mushrooms from picking up any more debris. Any movement of the Spore Spreader™ or even the slightest breeze will cause the spores to float out through the mesh sides.