Fresh Straps self-locking waterproof portable toilet air freshener straps from Surco Portable Sanitation Products cinch to the portable restroom vent pipe to control odors for up to 60 days. The clear plastic straps have a self-locking feature to deter theft. They are 100 percent waterproof to stand up to repeated washdowns. They are 100 percent recyclable and environmentally safe, and are available in Xtreme Clean and SummerFresh fragrances. They are packed 72 individually wrapped straps per case. 800/556-0111; www.surco.com.