Here are some pictures of my low-weight FT-857D backpack transceiver. It consists of an FT-857 transceiver, an SG-211 automatic antenna tuner, an antenna base for military whips, and a 5200mAh LiPo battery pack. The particular whip I use has a metric thread (M10). It was property of the army of the GDR.
The frame is made of aluminum and the total weight of the set is around 4Kg. I developed this backpack transceiver with SOTA (Summits on the Air) operations in mind, so I gave priority to low weight and rapid deployability, for when weather conditions are adverse. The rucksack also protects the radio from bumps and from the elements.