Funnily enough, the large format is the lightest bit...
Taking some photos tomorrow and decided to try out my new Lowepro Fastpak 200 which I got for a steal - £40 brand new.
Here's the "full kit"
5x7 + 3 film holders (6 shots total) - Contessa Nettel modified + 180/6.8 Dagor, Adox CHS100
6x7 + 3 rolls of film (30 shots total) - Pentax 67ii + 90/2.8, Fuji Pro160s
35mm + 3 rolls of film (70ish shots) - Leica CL + 40/2, Kodak Colorplus 200
Light meter - Sekonic L308
Focusing cloth - Calumet
Tripod plate - Manfrotto
Macro tube for 6x7
Spare batteries for 6x7
17lb or 7.7kg
Not sure how much the tripod weighs as well as all that.
Generally my kit doesn't include the 5x7 stuff, and would have a flash arm and flash instead. Probably 2-3kg lighter on a regular day.