650ml/850ml Stainless Steel Vacuum Flask | Travel Tumbler

Meet your perfect daily companion — the South Moon 650ml/850ml Stainless Steel Vacuum Insulated Flask. Built with premium food-grade 316 stainless steel and a double-wall vacuum structure, this stylish travel bottle keeps your drinks at the ideal temperature whether you're at the office, hitting the gym, or exploring the great outdoors.

Why You'll Love It

• Superior 316 Stainless Steel Interior: The inner tank and bottom are crafted from high-grade 316 stainless steel — more acid- and corrosion-resistant than standard 304 SS. Safely holds coffee, fruit juice, carbonated drinks, and more without any metallic aftertaste.
• Long-Lasting Temperature Retention: Double-wall vacuum insulation keeps drinks hot for up to 12 hours and cold for up to 24 hours — enjoy your beverage exactly as intended, every time.
• 100% Leak-Proof Design: A precision-threaded lid combined with a food-grade silicone sealing ring ensures zero leakage, even when the bottle is inverted or shaken. Your bag stays dry, always.
• Comfortable Soft Silicone Handle: The integrated silicone carry handle is skin-friendly and durable — grab and go without needing a separate bag or holder.
• Scratch-Resistant Matte Exterior: Eco-friendly matte spray coating is anti-fingerprint and wear-resistant, keeping your flask looking clean and polished after heavy daily use.
• BPA-Free & Non-Toxic Accessories: All plastic components use BPA-free food-grade PP material — completely safe for hot and cold beverages over the long term.
• Built-In Filter: The convenient built-in filter lets you brew loose-leaf tea or infused drinks directly in the bottle — no extra accessories needed.

Specifications

Perfect For Every Adventure

Whether you're commuting to work, hitting a trail, or relaxing at your desk, the South Moon vacuum flask is sized and styled for your lifestyle. Available in two capacities (650ml and 850ml) to suit light packers and big drinkers alike.

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For guidance on safe food-contact materials, visit the U.S. FDA Food Contact Substances page.

Learn more: Stanley (drinkware company)

Frequently Asked Questions

Q: What sizes does the stainless steel vacuum flask come in?

A: The flask is available in two capacities — 650ml and 850ml — giving you flexibility whether you prefer a compact travel bottle or a larger hydration option for full-day outings.

Q: Is this vacuum flask safe for carbonated and acidic beverages like coffee or fruit juice?

A: Yes! The 316 stainless steel inner tank offers superior corrosion and acid resistance compared to standard 304 SS, making it fully safe for coffee, juice, carbonated drinks, and more — without any metallic taste.

Q: How long does the flask keep drinks hot or cold?

A: Thanks to its double-wall vacuum insulation, the flask keeps drinks hot for up to 12 hours and cold for up to 24 hours, so your beverages stay at the perfect temperature all day long.

Q: Is the vacuum flask completely leak-proof?

A: Absolutely. The precision-threaded lid paired with a food-grade silicone sealing ring creates a 100% leak-proof seal — the bottle won't spill even when turned upside down or shaken vigorously in your bag.

Q: Can I use the built-in filter for loose-leaf tea?

A: Yes! The integrated filter is designed to hold loose-leaf tea leaves or fruit infusions, so you can brew directly in the bottle while on the go — no separate infuser or strainer needed.