The Skwert Topper cap is an accessory that converts most bottles into a single hand open & close flip top. It has a one of a kind flange for a direct no waste vapor stream. The cap is easy to open with your thumb and then close with your index finger and hearing a click sound, which indicates the cap is sealed. The cap also prevents spills, stains and odors. There are 2 standard size threaded bottles; the back of the package has a sizing guide to measure which size will fit your bottle. Care Instructions: Wash thoroughly with mild soap and warm water or toy cleaner. Pat dry and allow product to completely air dry. Store separately.