In 4th edition Dungeons and Dragons there is a humanoid race called: Dragonborn which are scaly and bipedal and can blast enemies with an elemental breath weapon.
Wizard's fourth edition D&D Player's Handbook does not provide rules, cost, or detail for a pack mule. However, a table is provided for mounts and transport: Item - Cost - Carrying Capacity Cart...
3.5 Is The Most Preferred System For It's Complex Rules And Fun Character Options, However 4e Is Much Simpler To Understand And Is Still In Most Stores Today. It Plays Out Like An MMO In It's Rule...