I love hammocks but there is a learning curve to dialing in a hammock setup to stay comfortable and warm. I generally sleep better in a hammock setup, though a ZenBivy on flat ground is pretty good too. Pros and cons for me.
Pro Hammock:
I never have to crawl around on my knees like I do in a tent
I have a built in seat for putting on boots, etc.
You don't need even remotely flat ground to sleep level and without bumps, roots, or rocks under you. I've set up on some steep hillsides and slept great on a hammock.
With the right setup you can sleep cooler in hot weather and just as warm in cold weather (only taken my setup down to 2° F but was plenty warm).
Downsides:
If there are no trees it's a non starter
If it's windy and rainy it's not as easy to hang out and pass the time
Tougher to split up and share the weight with multiple guys like a tent
Can be a bit more finicky to dial in the setup but gets easier the more you do it
There's probably more I'm not thinking about but in general I don't think a solid hammock setup is significantly lighter than some other setups. The bivy situation someone posted above is a good example. That said, weigh the pros and cons of what you are looking to do go from there. If you do decide to try a hammock spend some time on practice outings getting it dialed in. I'd also get a hammock that is at least 11' long and plan on a good underquilt. You can use a pad but it's less than ideal in a hammock.
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