OG Sack Convertible Yoga Tote with Backpack Straps Black on Black is part of our Made in Colorado Series. We set out to create a bag that differs in very positive ways from your standard gym and grocery/around town bag. Bag is large enough to hold the equivalent of three plastic grocery sacks. Multi-Strap System gives you the choice to carry your OG Sack Backpack Style, Tote Style or Messenger Style. Adjustable straps on the front of our bag fit any size yoga mat. For every bag purchased, one tree will be planted. Removable, hand washable, three pocket liner.