$ 2 each. Hemp plastic doob tubes are meant to be reusable when you purchase pre rolls or flower. This are a safe and convienent way to store your pre rolls or flower as they are smell proof and waterproof. Stylish and eco-friendly! These stash tubes are made of hemp-plastic and they're biodegradable (therefore, keep them out of prolonged sun and moisture). Child Safety Certified Locking Lid. Try one today.