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I am a three-dimensional grid.
I keep out intruders.
I also prevent disease.
I travel often to remote and rugged locations.

difficulty level: easy (1/5)

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A mosquito net. It is a fabric woven to make tiny squares (3D grid) to keep out mosquitos (the intruders), thereby preventing diseases like malaria. It is brought camping or hiking (remote and rugged locations).

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  • $\begingroup$ Bravo! +1 to you. $\endgroup$ – Michael Rize Feb 19 '15 at 3:52

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