With the Big Agnes I carried an extra pound to sleep in a hammock. I just bought a NeoAir so in theory the extra weight is about a pound and a half. To be comfortable either on the ground or in a hammock the extra weight goes up to two pounds. I need more stakes and guylines with a tarp.

I am doing a five night Grand Canyon trip in May and will be able to hang three of the five nights. Two pounds is worth it.
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"In theory, theory and practice are the same. In practice, they are not."
Yogi Berra