Glenn made some good observations here...but everyone has to hike their own hike, and if you want to carry more than you need to carry, that's your business, not ours.

That said. I never take jeans (they weigh a ton and never dry out if they get wet--talk about DEAD weight!) and I take ONE shirt for the whole trip. It's synthetic, dries in an hour, and weighs about 5 ounces.

And I never take the following things that you carry:

Sodas
Ice pack
leatherman (what equipment will you fix with the screwdriver, wrench, pliers, etc? A simple sewing kit with needle and thread make a lot more sense backpacking)

Electronics of any kind...except a camera that weighs about 9 ounces. No battery, no charger, no weight.

axe, saw, or shovel...I take a very lightweight plastic trowel instead..and almost never make a fire. If we do make a fire, it is with downed wood, and small pieces so that it is easy to control.

And for an eight day trip I still only carry a 55liter backpack

I figure if you leave the jeans, leatherman, sodas, ice pack, axe, shovel and larger pack behind...you will cut something between ten and fifteen pounds from your pack.

Which will put you at 35-40 pounds. Much better. More fun. And if you think about it a little more, I bet you can get it down to thirty. That's a huge difference.