Boz Pack Saddle with pack boxes Pack Saddle Our pack saddle is made the same as our Boz riding saddles. They come with the velcro and sponge comfort bars. They give your pack animal the same comfort and flexibility as your Boz saddle with its Boz Spring Flex saddle tree. We make pack boxes that are light weight and have the same strength as our saddle trees. They come in different colors and with a slot for the ropes to fit in so they don't slip.