In reply to N6PG :
Hi Scott, Pleased to meet you.
In the distant past (1980’s) up to 44 pounds but no longer. These days a QRO multiband / multimode up to 2 summit SOTA expedition with Li-Po 9Ah battery, IC706 and a Handheld radio weighs around 27 pounds in winter. A bit more for over two summits and bit less in summer. This includes all the other stuff you need.
For a QRP (FT817) expedition up to 20 pounds. Less for just a Handie. I find that the effect of pack weight on me is non-linear. I don’t notice I’m carrying a 15 to 18 pound pack. After that it starts to get heavy fast between 22 and 35 pounds. Over 30 pounds and I get discomfort in the shoulders but I find that I can carry more weight, further in winter.
I twice carried over 60 pounds up single (modest) SOTAs for winter overnighter’s and over 50 every field day and for summer overnighter’s but it’s very unpleasant and just a means to an end.
One way to keep weight down is to prehydrate about 2 pints or more of water depending on how long you are going to be out, then you can carry less. After that just get the smallest lightest gear within reason (cost). I saved significant weight by building some composite outer panels for the HF rig but it took too long. If you can afford it, it’s worth getting Lithium batteries instead of SLAB’s. The weight ratio is about 4 or 5.
I only use a 5m mast; it’s carbon. A home-brew dipole with 24 AWG wire & links for 80-60-40-20 weighs 0.8 pounds.
I personally can’t vouch for ‘vertical’ as that’s rock climbing. If I’m doing that for SOTA something has gone horribly wrong with my planning!
If you don’t really need it, don’t take it but you must carry the safety gear. Finally and what most people overlook is any excess body weight.
A previous post you may or may not find helpful: http://www.sotawatch.org/reflector.php?topic=770#