Solid XP is an idea pack by Spleef Master. It introduces a way to make Experience Orbs become items, as well as some handy XP stuff.
Description "Are you tired of losing all your XP when you die? Do you wish you could get bottles of XP in survival mode? Why is there no ore that corresponds to Minecraft's most valuable resource? All these questions have answers in Solid XP, Spleef Master's newest idea pack!