User blog comment:UnboundIsaac/Presents, w00t!/@comment-4661596-20151202162429/@comment-27766445-20151203152346

I found out the problem.When you use a single present, it does nothing. You must have 3 of one type in order for it to open a single present, and it consumes 3. Fortunately, the present drops are pretty high, so this won't bother me much