Now there is an option to check for a flavor bump during the checkout, but I'm not sure if it is possible to specify the bottle concerned or if everything will have a flavor bump with this option. I mean, imagine you order two bottles, one of BB, the other one of Hype. You only want a flavor bump on BB, if you check the option every bottles will have a flavor bump right? Maybe it is possible to specify this in the comments?
I think people just specify in the comment box upon ordering.