Here are two lightweight SOTA stations recently put together. The SSB station has been used, although the CW one is still waiting for the right opportunity! (running out of excuses here).
It weighs 900 grams including the carry case. A few more grams could be trimmed off by using Kevlar antenna wire and maybe lighter cables. The 4.5 metre squid pole is carbon fibre and weighs an extra 200 grams.
All up including the carry case, some instructions and a dummy load, it weighs 600 grams. The same 200 gram squid pole can be used.
The carry cases were obtained from Target and are intended for “action cameras”.