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For an overnighter?
Poncho (with stakes and guy line)
Poncho liner
Sleeping pad
Ground sheet
Liter of water
Sawyer squeeze
Small knife
Headlamp
Med kit
Extra socks
Warm hat
Extra shirt
Gloves
Emergency blanket
Bring food you don't need to cook and as long as temps aren't below freezing you should be totally fine, that's the setup I use mostly in the summer. If it's not overnight and you're being minimal all you really need is the water, the filter, your med kit, some snacks, and some extra socks