Premium 600ml double-wall insulated stainless steel flask with vacuum sealing technology for superior heat retention (12+ hours hot, 24+ hours cold). Eco-friendly bamboo lid adds natural elegance while preventing leaks with precision-engineered threading. Military-grade 18/8 stainless steel interior resists rust, odors, and flavor transfer for lifelong durability. Ergonomic curved design fits car cup holders and backpack pockets perfectly. Ideal for outdoor adventures, office commutes, gym sessions, and road trips. Mirror-polished exterior with scratch-resistant coating maintains premium appearance. BPA-free construction meets FDA food safety standards. Custom-branding available for bulk orders (MOQ 500pcs). Exclusive wholesale pricing for volume buyers.