Unique double-walled vacuum insulation technology with vacuum-seal cap keeps your drinks cold up to 24 hrs and hot for up to 12 hrs. Intimate design: - Specially designed cap to prevent spills, wide drip-free mouth opening for ice cube insertion (Diameter: 1.42) Security: - High-quality food grade 304 stainless steel on both inside and outside walls, 100% BPA free for health-safety. Further information: - Lightweight design - Perfect for your fitness packs, cars, bikes and backpacks to enjoy your long walks, hiking, hot yoga classes, prolonged travel or any other outdoor activities.