The new OctaLock™ Slim lid features our 100% leakproof BevLock™ lid to convert your Hopsulator Slim into a tumbler, OctaLock™ thread system to make taking your lid on and off a breeze, and our MagFlip™ technology to assist in keeping your lid open while you sip. Bring your favorite hot, cold, or iced carbonated beverage wherever, whenever. Fits OctaLock™ Hopsulator Slims.