I think it is safe to say we have all spilled a bottle of Poppers in the throw! The Patent Pending Aroma Topper turns your popper bottle into a 1-handed flip top. No more slippery, 2-handed battle with the bottle! In the past, getting the bottle open takes 2 hands. Keeping track of the removable cap is always a challenge, and then actually screwing the cap back on, all while you have more important things to focus on! With the Aroma Topper, just use your thumb to click it open and closed for a tight seal and no rubber gaskets to lose. Helps prevent spilling, staining and waste. The nose cone inserts into your nostril perfectly so you can get all the whiff. The Aroma Topper fits most traditional popper bottles. It comes in 2 sizes, Small and Large. The size is based on the thread size and the diameter of the cap, not the bottle size (that can vary). Shorter, 10 ml bottles like Rush tend to use Large, while 30 ml bottles usually have a smaller opening and use the small-threaded Aroma Topper. The Aroma Topper is the 3rd product in the Skwert line. For easy on-the-go clean, try the Skwert Water Bottle Enema. Also check out the Skwert Lube Injector that turns any lube bottle into your personal injector. Please be advised it is impossible for this product to work perfectly with every type of bottle that is manufactured. For storage and travel, please seal in the cap provided with bottle. Do not store upside-down or on side with Topper attached.