Bobber Flask

A stainless steel flask built to hold temperature for up to two full days — up to 48 hours hot and 72 hours cold in the 1000ml. 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 — 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.

Heat retention by size

• 500ml: hot up to 24 hours, cold up to 36 hours
• 770ml: hot up to 36 hours, cold up to 54 hours
• 1000ml: hot up to 48 hours, cold up to 72 hours

Tech features

• Long-life insulation: independently tested vacuum insulation, top of the category — retention scales with size (see above).
• 100% leak-proof: Engineered silicone seal and precision threading, 50,000-cycle tested.
• Cup-cap built in: the lid doubles as a cup — 74ml to 130ml depending on size — 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: 500ml — 24h hot / 36h cold · 770ml — 36h hot / 54h cold · 1000ml — 48h hot / 72h cold
• Cup-cap volume: 74ml (500ml) · 109ml (770ml) · 130ml (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.