What is the Uppercut Punchbag? Textile filled for a natural even balance, the Uppercut punchbag features a higher level of fabric towards the top end of the bag so that uppercuts & angled hooks can be performed. Due to its top heavy nature, the bag is in addition filled with an even greater amount of material & a synthetic hide which prevents tearing & slipping of the fabric. Stitched in d-rings & bottom rings ensures minimal swing during use which allows for a more efficient & focused workout.