�� GRIP brand Unfilled Grip‑Punching Bag An unfilled punching bag is basically the outer shell only — it comes without fill material (sand, cloth, foam, etc.), allowing you to control how heavy or dense it is. The “grip” aspect usually implies either handles or gripping points, or reinforced hanging/hardpoints to allow you to hold, clinch, pull, or perform grappling‑type drills. The bag’s hanging hardware (or straps) are designed to give you extra options beyond just striking. �� Key Features / Components Here are the components and design features you should expect or look for in a good grip‑boxing punching bag (unfilled): Component What It Should Be / Why It Matters Shell Material Tough outer layer: PU (polyurethane) or “Powerhide”, “MayaHide”, leather, or heavy‑canvas. Needs to resist abrasion (especially from gloves), tearing, and wear. Inner Lining / Reinforcement Double or triple stitching, cross‑stress panels, internal straps or webbing to distribute load, reinforced top/hanging points (D‑rings or straps), sometimes a bottom tether for stability. Grip or Handles If “grip” means handles: strong side handles (for clinch work or grab drills), top handles for carrying or adjusting, possibly bottom loops. These must be well‑stitched and ideally reinforced with extra material or internal webbing. Hanging Hardware Strong top rings or straps; sometimes D‑rings. Chain or swivel connectors may be included. The hardware should handle the max filled weight plus dynamic forces (punches, kicks). Closing / Filling Access A zip or flap at the top so you can fill it. The opening should be strong and closable securely so fill doesn’t escape. Sometimes there’s also drainage or air vents for water‑fillable bags. Maximum Fill Weight / Capacity The bag needs to say how much weight it can safely support; also size (length/height) matters depending on your training. Taller bags allow kicks, etc. Shape & Size Standard cylindrical, length options 3‑6 feet or more; diameter important so you get realistic striking surface. Taller or wider bags for kicks/Muay Thai; shorter or thinner for boxing. The grip feature may affect shape or thickness. Padding / Impact Feel Even though unfilled, the shell does contribute somewhat; once filled you want padding so strikes aren’t damaging to joints. Some shells have shock‑absorbing lining or foam inner layers (if partly filled with foam). Bottom Features Some bags have bottom loops or D‑rings so you can tether the bottom (reduce swing), or attach weights/anchors; useful for grip work or to prevent excessive swinging.
