Hippo Sak is made stronger, thanks to our innovative Power Strip and tri-flex film. The Power Strip creates a reinforced bottom seal, making Hippo Sak 10 times stronger than standard grocery bags. No more leaks, holes, or tears!. Stronger and more durable. Reduces bag usage. Environmentally friendly. Hippo ties prevent bag contents from spilling over in the car. Shoppers have fewer bags to carry and load into their car. Wider and thicker hippo handles are more comfortable to carry. Shoppers prefer to reuse Hippo Sak at home more than any other grocery bag. The Power Strip gives Hippo Sak a bottom seal that's more than 10 times stronger than regular seals