Bobber Flask

A stainless steel flask that holds your coffee hot for 48 hours and your water cold for 72. Independently tested, awarded, hard to break.

Most flasks promise all-day insulation and lose half the heat by lunch. The bobber Flask runs on vacuum-sealed double-wall 18/8 steel that holds drinks at temperature for two full days — proven, not marketed. The cap doubles as a cup. The seal is engineered to a leak-proof standard most flasks at this price don't reach.

Tech features

• 48 hours hot, 72 hours cold: Independently tested vacuum insulation, top of the category.
• 100% leak-proof: Engineered silicone seal and precision threading, 50,000-cycle tested.
• Cup-cap built in: The lid doubles as a 200ml cup for coffee, tea, or soup.
• Pure-taste interior: Metal stopper plate stops liquid touching plastic, so your drink tastes of itself.
• Narrow-mouth opening: Easier on the lips and locks heat in.

Materials

• Body: 18/8 food-grade stainless steel — no coating, no plastic on the inside.
• Seal: Food-grade silicone, BPA-free.
• Cap: Stainless steel with a soft inner ring.
• Care: Hand-wash only.

Specs

• Capacities: 500ml, 770ml, 1000ml
• Construction: Double-wall vacuum-insulated
• Heat retention: Hot up to 48 hours, cold up to 72 hours (1000ml)
• Colours: Matte, Glossy, Cayenne Red, Ginger Tonic, Light Blue, Sand Grey, Iced Water, Black Coffee, Sage Green, Deep Teal
• Warranty: 5-year manufacturer warranty
• Awards: Red Dot, iF Design, Good Design

About bobber

Stainless steel drinkware made to actually work — long-life insulation, no plastic on the contents side, and design awards from MoMA to Red Dot.