Premium cannabis oil cartridges meet affordability with the new Daily strains from O.pen. This is why O.pen (formally O.penVAPE) made it number one on our list. The company has a long history of consistently upgrading its products to give customers an incredible experience every time. They have a variety of products, from distillate carts to live resin carts to suit consumer preferences. They also have nearly 40,000 Instagram followers and display a bunch of their products on there.