Transformers Optimus Prime Plushie Backpack Set - Bundle with 16" Optimus Prime Plush Doll with Carrying Straps Plus Tattoos, More | Transformers Gifts for Kids, Boys, Girls. This Transformers gift set includes one 16" Optimus Prime plush doll with adjustable carrying straps to bring Optimus Prime with you anywhere. Sure to be a hit with all Transformers fans, this plushie set is great to give as a gift to the Optimus Prime fan in your life! Take Optimus Prime with you wherever you go! These adjustable shoulder straps are great to keep Optimus Prime on your back with you. Plush features a small compartment for storing small items. Officially licensed Transformers Optimus Prime plushie set for boys and girls alike also comes with Transformers temporary tattoos, and a Rex-Man door hanger.