I was writing on a slightly related subject when it occurred to me that "the big four" might be an interesting topic.
I recently made up a new "summer good weather" overnight list and found that my "Big Four" weighed 6.9 pounds. I have, in the past, found beginners trying to reduce pack weight too often still carry many extra pounds in this area. For summer I certainly wouldn't carry more than 4 kg (8.8 lb) in that category.
Shelter - 24.0 oz SilNylon REI 9x9 Tarp
Backpack 70L - 40.0 oz My Trail
Sleeping bag - 28.2 oz Lafuma 800
Sleeping pad - 19.0 oz Big Agness
TOTAL 7.0 lb

What does your summer "Big Four" weigh?
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Jim M