Thermoplastic films and bags with improved strength properties created by angled selfing

A thermoplastic bag comprising:

• a first layer formed from a first thermoplastic film, the first layer comprising first and second opposing sidewalls joined together along a first side edge, an opposite second side edge, an open first top edge, and a closed first bottom edge;
• a second layer formed from a second thermoplastic film, the second layer being positioned within the first layer, the second layer comprising third and fourth opposing sidewalls joined together along a third side edge, an opposite fourth side edge, an open second top edge, and a closed second bottom edge;
• a first plurality of raised rib-like elements extending intermittently across the first and second opposing sidewalls of the first layer at a first acute angle relative to a machine direction of the first thermoplastic film;
• and
• a second plurality of raised rib-like elements extending intermittently across the third and fourth opposing sidewalls of the second layer at a second acute angle relative to a machine direction of the second thermoplastic film, the second acute angle being different from the first acute angle;
• wherein the first plurality of raised rib-like elements are configured to redirect propagating tears away from the machine direction of the first thermoplastic film.