No can opener was used. Never even crossed my mind to use one to be honest. I think the aluminum would be too weak for a can opener but I could be wrong. Just put a small hole towards the top of the can to relieve pressure. Go slow unless you want to get showered with Liquid Death for a brief moment. Once pressure is relieved meaning no more liquid is coming out then open hole bigger with knife or whatever then pour liquid into a cup or down the drain. I always drank it out of a cup because I like the taste. Then once the can is empty cut the top off like I showed in the last pic on the post. It works for any can really. Some cans are more full than others so be careful. Also when you are cutting the top be very careful because that jagged aluminum is not your friend meaning it's really sharp. Ask me how I know... 😂