Stainless steel vacuum-insulated flasks

insulated stainless steel water bottles, each with a capacity likely around 700-750ml, designed for keeping beverages hot or cold. 

Details of the bottles:

Material:

Made from durable stainless steel, often with double-walled, vacuum insulation for temperature retention. 

Design:

Feature a sleek, modern design with a leak-proof and travel-friendly secure cap, and a smooth-flow lid. 

Capacity:

Typically available in capacities like 700ml or 750ml, suitable for all-day hydration.

Portability:

Lightweight and easy to carry, making them suitable for various activities like travel, gym, or daily use.