What is NightCap?
At a first glance, NightCap looks like your ordinary hair scrunchie. But closer observation reveals that this scrunchie has a small hidden section that holds a flexible cover made of nylon/ spandex, which can be used to cover your glasses. This unique scrunchie that looks fairly innocent and fashionable, could very easily save you from the nightmare of having your drink spiked when you re out having fun. It is machine washable and has a small opening for a straw. Also available is a separate carrying bag with stainless steel straws and a specially designed cleaning brush.
NightCap looks like a scrunchy but acts as a cover for the glasses (nightcapit.com)