If you want to be able to pull a Prime in every pack read this. Packs with Prime cards are interesting. They are probably the first packs I've noticed that weigh noticably more than packs with a rare holo. So I've over the last year tried to think of a system that allows for a high chance of pulling a Prime without using a scale. And I think I've found it. 1. Go to a retailer who has individual packs that aren't from a box. Usually target or walmart. 2. Take 16 packs off but do not buy them. 3. Divide the stack in two and decide which set is heavier. 4. Have a friend or Parent do the same but make sure they don't know which you thought was heavier. 5. If they agree with what you thought. Take that stack and put the other back on the shelf. Then repeat 3-5 on this list until you have it down to one pack and buy that pack. 6. If at any time there is a disagreement shuffle the packs and weigh again. I have had success with this pulling a Mew Prime, Yanmega Prime and Celebi Prime in three triumphant packs. I wish you the best of luck at this method.