Premium 17oz/500ml stainless steel vacuum flask with double-wall insulation technology. Food-grade 304 stainless steel interior ensures BPA-free safety for beverages. Advanced vacuum sealing maintains temperature for over 8 hours (hot) or 24 hours (cold). Mirror-polished exterior features durable scratch-resistant coating. Ergonomic spill-proof lid with smooth thread design for one-handed operation. Perfect for office commutes, outdoor adventures, gym sessions, and travel. Commercial-grade construction withstands daily use in hospitality or healthcare settings. Superior condensation-free performance prevents surface sweating. Compatible with most cupholders and backpack pockets. Cost-effective bulk purchasing option available for corporate gifting or retail resale.