Thermoplastic bags with duplicative seals

A thermoplastic bag, comprising:

• first and second sidewalls comprising thermoplastic films;
• the first and second sidewalls comprising a first side edge, an opposite second side edge, a bottom edge, and an opening along respective top edges;
• a first seal securing at least two plies of thermoplastic film together along a first portion of the thermoplastic bag;
• and
• a second seal securing the at least two plies of thermoplastic film together along the first portion of the thermoplastic bag;
• wherein:
• the first seal has a first bond strength that causes the first seal to fail prior to failure of the at least two plies of thermoplastic film when strained;
• and
• the second seal has a second bond strength that causes the at least two plies of thermoplastic film to fail prior to failure of the second seal.