Rochester Midland Half-Fold Toilet Seat Covers, 250 Sheets Per Pack, Carton of 20 Packs Sold as 5000/CT. Half-folded toilet seat covers can be used in most public restrooms and dispensers. Each seat cover guards against E. coli, staph, herpes and other infections that can be passed by contact with public toilet seats. Toilet seat covers are septic-system safe material.