It is amazing how many things I can fit into my Yoga Sak. Apart from fitting my yoga mat, the bag also fits laptop, the charger, water bottle, small speakers and other items that I will need for my class. Sometime, I can even fit in a yoga block or two.
With all the items I have listed above, the Yoga Sak does get heavy. One of the Yoga Sak gray fetuses is that the bag is made with a good back support. So, I do not have to worry about injuring my back.