A bottle of water can only get you so far in the wood. And the more water you carry the more weight you have to sustain and the faster your body to losing its water content. To solve the problem, we can take advantage of filtering water on demand.

PurTrek might look like a regular trekking pole, but it hides a portable water filtration system designed to make sketchy water drinkable. Unlike most outdoor water filters, PurTrek uses a hand pump to quickly squeeze particles and bacteria from the water.

The company that made that product claims it should last up to 2000 liters (528 gallons). That’s worth a person’s annual water consumption for nearly three years.