Specialty Plastic Fabricators has been manufacturing Silo Breather Bags and Straight Breather Bags for over 40 years. Our breather bags are made in a traditional time tested design using thin flexible plastic sheets which are RF welded. We use specially made 16 gauge vinyl which is formulated to resist mold, mildew, fungus and rot – and to perform in temperature extremes. Standard internal bag sizes are for 20′ diameter and 25′ diameter silos and 5′ and 7′ straight bags typically used as external breather bags. We can also manufacture custom bags upon request. All breather bags are of the same high quality with features shown below.