Okay. You're using 7Ds with grips, and the 17-40 f4. 50 f1.8 and 70-200 f2.8, and you want a smaller, lighter kit that covers this focal length range that is also economical.
17-40 f4 is like 27-64, 50 is like 80mm, and 70-200 is like 112-320. So you want a focal length range that covers 24mm - 300mm+, with a fast portrait lens in the middle.
A light and inexpensive option is the Panasonic G85 with secondhand Olympus 12-40 f2.8, 45mm f1.8, and 40-150mm f2.8. The Olympus lenses are all much smaller than their aps-c or full frame counterparts and outperform them except for the 70-200, which is an excellent lens. The only caveat is high ISO performance, as noted before. For most situations, m43 is acceptable. I use that format for most of my personal work, unless I want full frame. Third party manufacturers make battery grips for the G85, so with some shopping around, you can get a very decent photographic package for much less than paying retail.
Others mention the Canon RP, which is smaller and lighter than the 7D, but it still means carrying the large 70-200. I feel that a lot of the weight of your setup comes from the lenses, not just the bodies.
If you're happy with aps-c and want that focal length range, how about a gently used Fuji XT2 or XT3 with the 18-55mm f2.8-4, 55-200mm f3.5-4.8, and 60mm f2.4 Macro for portraits and close ups. With judicious shopping, this will cost a lot less than retail. The XT2 and XT3 have battery grips and perform well at high ISO. But this kit will weigh more than the Panasonic G85 kit above.
Do you have some idea of budget? And will you completely trade in your Canon gear? How often do you shoot in challenging (very low) light?
Here are examples from the Olympus 40-150mm f2.8:
https://www.flickr.com/groups/oly_40-150mm_28_pro/pool/127790525@N06
and from the Olympus 12-40mm f2.8
https://www.flickr.com/groups/olympus_ed_12-40_f28_pro/pool/page1/
and from the Olympus 45mm f1.8
https://www.flickr.com/groups/1759398@N21/