Whether you need to keep your morning coffee hot during a long commute or want cold beverages for a day at the beach, the right Isothermal Flask is essential. For larger family outings or all-day events, our 650ml Isothermal Flask might be a perfect companion. However, when volume is the priority, our 1.3L model stands out. Constructed with a certified Food-Grade Isothermal Flask interior, it guarantees that your drinks and homemade soups remain pure-tasting and safe. Its robust design and substantial capacity make it the ultimate Picnic Isothermal Flask, effortlessly catering to groups and extended trips without the need for frequent refills.


The design of the 1.3L Isothermal Flask prioritizes both performance and user convenience. It features advanced vacuum insulation technology that maintains the temperature of its contents for exceptionally long periods. Below is a detailed breakdown of its key specifications and materials used in its construction.

  • Capacity: 1.3 Liters (44 US fl oz)
  • Heat Retention: Keeps liquids hot for up to 24 hours
  • Cold Retention: Keeps liquids cold for up to 36 hours
  • Material (Interior): 304 Stainless Steel, Food-Grade Certified
  • Material (Exterior): Durable BPA-Free Plastic
  • Lid Type: Leak-Proof Screw Cap with Integrated Cup
  • Dimensions: 11.8 inches (30 cm) in height, 4.3 inches (11 cm) in diameter
  • Weight (Empty): 1.65 lbs (0.75 kg)
Feature Description Benefit
Double-Wall Vacuum Insulation A sealed airless space between two stainless steel walls. Eliminates temperature transfer, ensuring maximum thermal efficiency.
Wide Mouth Opening An opening diameter of 2.2 inches (5.6 cm). Allows for easy filling, cleaning, and adding ice cubes.
Ergonomic Carry Handle A sturdy, foldable handle attached to the lid. Provides a comfortable and secure grip for easy portability.
Non-Slip Base A rubberized ring on the bottom of the flask. Prevents sliding and spills on uneven surfaces.

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