Hydro Flask is a water bottle brand owned by American conglomerate Helen of Troy Limited. The brand became popular during mid-to-late 2019 and early 2020. Hydro Flask is particularly well known among millennials and zoomers, as well as college students and the "VSCO girl" subculture; social influencers and celebrities, especially on TikTok, increased the brand's popularity. Hydro Flask's prominence has played a role in the rising environmental and health consciousness of millennials and zoomers and has influenced the quality and appearance of other reusable water bottles.
MATERIAL
Bottles can be made of plastic, stainless steel, glass, or aluminum. These are the four most famous materials used in bottles. You should select a material that has no BPA or Bisphenol-A. It is usually found in low-quality plastic bottles. BPA is a harmful substance that can leach into your water. It can result in hormonal imbalances, pregnancy disorders, organ failure, and even cancer. The material used in your water should also be able to withstand impacts especially if you are bringing it outdoors.
DURABILITY
Stainless steel is known to withstand high impacts without breaking or easily having scratches and dents. Glass is a brittle material for a bottle, though it is considered to be one of the safest. Aluminum bottles are also made of sturdy and light material, however, they can sometimes make your water taste like metal.
INSULATION
Some bottles offer insulation and vacuum sealing. This allows your drinks to stay cold or hot for hours. Glass and aluminum bottles can hold both hot and cold beverages. However, they have no vacuum seal and insulation so they cannot maintain your drinks’ temperature for a long time. Plastic bottles can lose their shape if you put hot water inside of them. Stainless steel bottles can hold both temperatures. It can keep your water cold for up to 12 hours and hot for about 8 hours. If you want to put some ice in it, they can stay solid for several hours as well.
EASE OF USE
Your bottle should be easy to use and clean. Some bottles can retain the smell and color of your previous beverage even if you wash it every day. Some bottles can also be hard to open and refill. It happens when you have a very narrow bottle. A wide-mouth bottle is easy to use, refill, and clean. If you have a filter, you can easily refill it in a freshwater source. You can insert a sponge and a bottle brush easily to clean the inside of the bottle thoroughly. 
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