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Hijacking the thread.
I daily a 4l backpack. I can easily fit my rain gear, a powerbank and spare socks into 0.5l.
Is it physically possible to fit some stealth camping gear into the remaining space? I've seen tarps that can pack as small as 20mL, but what about a sleeping pad and a bag/quilt? Every time I look for compact stuff I get bulky ultralight crap instead.