I have had this discussion many times with people. I carry a rear bag attached to the butt of my rifle (for prone shots) and a bipod on the rifle, as well as quad sticks. My hill stalking rifle is an 18lb 300WSM.
I also carry both a wind meter, range finding binos and a ballistic calc on my phone...
On a typical stalk up the hill I wouldn't blink at a few kilometres with that kit, hopefully with a few reds in tow on the return journey!
On my DSC 2 not so long ago my assessor was laughing at the amount of kit when we first met, all until he saw me shoot a red stag off a gate in a shot he thought was exceeding difficult - with a bag to rest on and quad sticks to support the butt of the rifle it was a very easy shot. He didn't take the mick out of the kit after that, as he realised it made me very accurate and able to take more difficult shots with ease, it certainly doesn't slow me down either....
Ben