According to the best historians, early man domesticated the dog so we could throw him/her in a backpack and go on a quest for maximum action and merriment.  Who are we to go against the words of the experts?  Yes, we created the K9 Sport Sack because academia mandated it but also because we truly have loved taking our pets hiking, biking, cycling, skiing, snowboarding, shopping and larping and we truly want to share that possibility with humans and dogs all over the world.