![]() UV filtration bottles are popular and convenient for those who are traveling to areas where water quality may be harmful, or where bottled water is not readily available. ![]() UV light can also be used to purify water. This type of bottle is often BPA-Free and more commonly uses carbon (activated charcoal) filtration. Such bottles may still break if dropped, and thus some brands are triple-layer, with the glass inside two layers of plastic this is a common configuration for large flasks intended for coffee or other liquids that need to be insulated. Some types of vacuum-insulated flasks use an inner layer of glass (which is easy to clean), and an outer layer of metal or plastic which helps shield the glass from breakage. Like metal, they also have a high level of temperature transfer, so they are not ideal for very hot or cold liquids. Glass bottles are heavier than plastic, stainless steel, or aluminium, and are easier to damage or completely break. Because they are completely recyclable, are BPA-free, and do not retain and transfer taste or odor, glass water bottles are becoming a popular choice again for many consumers concerned about their health. ![]() ![]() Glass flasks have been used since ancient times, though were not common until the Early Modern period when consistent, bulk manufacturing of glass products became easier. Glass water bottle with protective silicone sleeve They are typically vacuum-insulated, but some may have a solid or gel insulation between the metal walls. Because double-walled bottles have more metal in them, they are more expensive. Double-walled metal bottles are insulated to keep cold liquids cold and hot liquids hot, without the external surface being too hot or too cold. Single-walled metal bottles readily transfer temperature of contents to external surfaces, which makes them unsuitable for use with unusually hot or cold liquids. Metal (especially steel) water bottles can be heavier than their plastic counterparts. Bottles made with food-grade stainless steel ( grade 304, also known as 18/8) do not transfer taste or odor. Stainless steel bottles that do not contain a liner have been known to transfer a rusty taste and odor to contents. Depending on the type of source material and manufacturing process behind a stainless steel bottle, trace amounts of minerals can leach into contents from this type of bottle as well. orange juice), as this could cause aluminium to leach into the contents of the bottle. It is not recommended to fill aluminium bottles with acidic liquids (e.g. Glass liners may also be used (see next subsection). Although most liners are now BPA-free, older and less expensive models can contain BPA. Metal bottles thus often contain a resin or epoxy liner to protect contents from taste and odor transfer or corrosion. Made primarily from stainless steel or aluminium (aluminum), they are durable, retain less odor and taste from previous contents than most plastic bottles, but can sometimes impart a metallic taste. Metal water bottles are growing in popularity. Copolyester and polypropylene offer the greatest rigidity HDPE retains some flexibility LDPE (most commonly associated with collapsible, squeeze bottles) is highly flexible. The main difference between each type of water bottle is the flexibility of the material. All offer the advantage of being durable, lightweight, dishwasher-safe, and BPA-free. Multi-use water bottles can be made from high-density polyethylene (HDPE), low-density polyethylene (LDPE), copolyester, or polypropylene. The increase in the use of single-use personal plastic water bottles has contributed markedly to the country's litter problem, though the increase in the popularity of bottled water has come with a decrease in the growth rate of consumption of soft drinks (which pose health risks in excessive quantities, as well as the same littering problem). Mexican citizens drink more bottled water than those of any other country do, an average of 61.8 gallons per person each year – more than twice the rate of US per capita consumption. For example, as of 2010, Mexico had an average 8 percent increase per year in bottled water purchases, and consumed approximately 13 percent of the world's total of bottled water. In some countries with low-quality tap water, citizens also use bottled water (including in family-size containers kept in the home) for health reasons. The International Bottled Water Association (IBWA) states that people are increasingly relying on water bottles for convenience and portability. In 2017, The US spent $11.5 billion on bottled waters. In 2011, greater than US$11 billion was spent on bottled water products in the United States alone. Sales of single-use, pre-filled plastic water bottles have increased almost every single year for more than a decade. A one gallon PETE water bottle with attached package handle
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