My current kit for week-long hikes in is 5Dmk3, Voigtländer 20mm, Canon 40mm and 70-300L, plus Ricoh GR. Works pretty well for me.Wow. 8+ pounds? Plus the space required in the pack. What kind of hiking are you doing?
Walking in the wilderness (Lapland), away from the civilization - last fall I was there alone and didn't see anybody at all for six days.
In my case, I will be totally off the grid for 10 days covering ~90 miles in the mountains. There could be daily rain.
I remember one hike when it rained every day and last three days almost nonstop... it was still fun, though not exactly photogenic. :-)
I'm in a group of around 14 scouts and adults. Only stops I will make are for daily program camps, and food pickups every 3 or 4 days.
Being able to refill food en route helps - I carry everything for the entire trip. In autumn there're usually berries and mushrooms, though.
No power, etc. So whatever I take, I have to carry for the duration. The only weight variations are from food/water consumption and whatever weight I might take on for someone else having trouble.
One nice thing about Finnish Lapland is that there's no need to carry water, there's plenty of drinkable water around. Otherwise I have to carry everything I need, too.
So while I have learned that adding a little weight isn't a big deal if I'm in shape and trained for the trip, throwing caution to the wind and taking what you take would likely make the trip miserable for me.
Throwing caution to the wind is not a good idea in the wilderness. I've been hiking for years and know what I need and how much I can carry (about 30kg is my comfort limit), but if you're new to the game, don't overpack.