It's important to hydrate while mountain biking, but what's the best method for carrying water? You have a number of choices, and what's best comes down to personal preference. Possibilities include a standard plastic water bottle in a bottle cage, larger Nalgene-style bottles inside a small backpack or a hydration pack with a hydration tube on the shoulder strap.
Bottle Cage
Putting a plastic cycling bottle in a bottle cage is the traditional method for carrying water while mountain biking. The cage is usually screwed into the down tube and carries one standard 20- or 24-oz. bicycle water bottle. The cage can also be screwed into the seat tube or on both tubes to carry two bottles. This is an easy method for carrying water, as the bottle is always within reach for quick hydration.
Bottle in a Backpack
You don't need a bottle cage to carry a bottle. If you just have a bottle, such as a Nalgene or bicycling bottle, but no cage, just throw it in a small backpack, along with any other items you'll need for your ride. The advantage of this method is extra room for supplies like food, tools, or layers for fluctuating weather. You won't be able to hydrate on the go, however, since you'll need to stop to reach the bag, so this is the least convenient hydration method.
Hydration Pack
Hydration packs, like those from CamelBak, have become a fixture for cyclists and other on-the-go exercisers. This is due to their extreme convenience, ease of use and functionality. Hydration packs come in many sizes and styles and hold all the advantages of both previous methods. The water is stored in a bladder in the pack with a tube running along the shoulder for immediate access to water. Many styles also have storage room for food, tools, and clothing. Many mountain bikers prefer this option, though it is also the most expensive.
How Much Should You Carry?
The amount of water you'll need depends on how long and intense your ride will be. For short rides or longer rides that are not strenuous, a single 20- or 24-oz. bottle should be sufficient, or a 1-liter Nalgene will do. For more serious rides with longer routes and more climbing, you should pack two bottles or a 2-liter hydration bladder. On long, strenuous rides of two hours or more, a 3-liter hydration bladder is the safest bet. You should also take into consideration your personal hydration needs as well as climate. Hotter and drier climates will demand you pack more water to avoid dehydration.
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