• Hydration is essential for athletes of all kinds, and if you drink multiple bottles full of water a day, you should own reusable bottles so you can avoid adding more plastic to the world's landfills. Reusable bottles have other advantages, too, such as durability and fashion. And, luckily, you can choose from a variety of models and brands.
  
  

Nalgene

• Nalgene water bottles are relatively cheap (under $10), and have been popular for years among athletes and non-athletes alike. They are large enough to carry your water supply for a full day at school or work, or for a long run. The cap is attached to the bottle with a loop. These bottles come in a wide variety of colors, and many people enjoy personalizing them with stickers.
  
  

CamelBak

• CamelBak makes several different soft plastic water bottles. Compared to the rigid shape of a Nalgene, these bottles' soft frames might be easier to drink from while moving or running. They are also inexpensive (under $10), but they do not come in nearly as wide a variety of colors as some other water bottles.
  
  

Sigg

• Sigg water bottles have become particularly popular recently, thanks in part to their flashy colors and designs. They are made out of recyclable aluminum rather than plastic. While this material is better for the environment, it does tend to dent if dropped. These bottles are more expensive than plastic water bottles, and can cost up to $20.
  
  

Klean Kanteen

• Klean Kanteen also makes recyclable water bottles, out of stainless steel rather than aluminum. This material makes Klean Kanteen bottles slightly more durable than Sigg bottles. These bottles usually cost between $15 and $20.