O.pen, formerly known as O.penVAPE, is a Denver, Colorado-based company that has established itself as a pioneer in the vape pen industry. Founded by a group of dispensary owners and growers, the brand is widely recognized for its high-quality, easy-to-use vaporizer devices and cartridges. A core part of their mission is to provide simple, reliable, and discreet consumption methods for both medical and recreational cannabis users.

The company's products include a range of vape batteries, such as the 2.0 Variable Voltage and the discreet Conceal series, designed to be compatible with standard 510-thread cartridges. They also offer a variety of strain-specific oil cartridges, including their Daily, Signature, and Elite lines, which are filled with cannabis oil extracted using a clean CO2 process. O.pen is also an advocate for cannabis legalization and research, and a founding member of the National Cannabis Industry Association.