How Much Water Should You Carry on a Hike?

Water is the heaviest thing in your pack. Learn how much to carry for any hike and how a portable filter lets you carry less between reliable sources.

A baseline, then adjust

A common planning baseline is roughly half a liter per hour of moderate hiking in mild conditions. Heat, altitude, exertion, and dry air all push that number up — hot desert hiking can double or triple it. Learn your personal rate on short trips before committing to long dry stretches.

Let the map decide

With a filter, you carry water between sources, not for the whole route. Mark reliable water sources on your map, note the longest dry stretch, and carry enough for that stretch plus a margin. On water-rich trails that can mean carrying a single liter; on dry ridges it can mean four.

Treat 'seasonal' sources with suspicion in late summer, and check recent trail reports when available.

Carry it smart

Split capacity between a bottle you can drink from while walking and a reservoir or soft bottles for bulk. Keep your filter accessible — a filter buried in your pack is a filter you will not bother using, and dehydration creeps up quietly.

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