Bottle Body High Borosilicate Glass (3.3 grade or higher) Frosted/Matte Must be single-wall construction. High clarity before frosting. Bottle Cap/Lid Food-Grade Stainless Steel (e.g., 304) OR Food-Grade PP Plastic (BPA-Free) with metal exterior finish. Brushed or Polished Metal-Look Must be leak-proof and include an inner silicone gasket (food-grade). Sealing Gasket Food-Grade Silicone (e.g., LSR) N/A Must ensure a 360-degree watertight seal. Carrying Rope/Strap Durable Nylon or Polyester Weave N/A Must be securely anchored to the cap, capable of supporting the bottle's full weight when filled. All Plastic Components Food-Grade Polypropylene (PP) or Tritan N/A Must be certified BPA-Free and Phthalate-Free.