A bag with reinforcing seam tape is provided. The bag has a bottom, at least two sides, and at least two ends formed from textile panels; the textile panels are joined by seams. A reinforcing seam tape adheres to at least a portion of the seam. The reinforcing seam tape is made of thermoplastic polyurethane having a thickness between 0.3 millimeters and 0.8 millimeters. At least one face of the seam tape may have a cross-sectional shape that provides structural support to the bag.