Cola Stainless Steel Vacuum Insulated Water Bottle

      These stainless steel water bottles are made of food grade 18/8 stainless steel that is strong and rust proof for unique durability. BPA-free, healthy and environmental friendly, won't retain or transfer flavors.

      Cola shape water bottles fits most car cupholder, bicycle water bottle holder, backpack side pocket etc. Easy to carry, ideal waterbottles for outdoor sports, gym, backpack, camping, climbing, hiking and other activities. You can take it with you when you go to work, travel, yoga, class, have a picnic. Fashion aesthetic water bottles bulk are also the best gifts of Thanksgiving, Christmas, anniversaries, birthdays for women men adults.

      The vacuum thermos flask is also called a thermos flask or a thermos flask. Its thermal insulation principle is achieved by utilizing the vacuum layer between the two walls of the bottle. The vacuum layer works by creating a vacuum, which means there is no air or gas between the inner and outer walls of the flask. Since air is a good conductor of heat, a lack of air minimizes heat transfer by conduction and convection. This prevents the contents of the flask from losing heat to the surrounding environment or gaining heat. In addition, the inner and outer walls of the flask are generally made of stainless steel, which is a poor conductor of heat. This helps to further reduce heat transfer since stainless steel has a lower thermal conductivity. The vacuum layer and the flask's stainless steel walls together effectively trap heat, keeping the contents hot or cold for longer. This makes vacuum flasks a popular choice for keeping drinks at the desired temperature while on the go.