Same gear, same weight, completely different day. Load position and hipbelt fit do more than any ultralight purchase.

The most common complaint on a first backpacking trip is shoulder pain, and the cause is almost never the total weight. It is that the load is sitting behind the body instead of above the hips. Fixing the load position and the belt costs nothing and changes more than a thousand dollars of lighter gear would.
Food bag, water and bear canister go close to your back, between the shoulder blades and the top of the hipbelt. Weight held away from your back levers you backwards and your shoulders fight it all day.
The bottom of the pack is for light bulky things: sleeping bag, spare insulation. It creates the base and it takes no load.
Tent, stove, cook kit. Keep the density near the spine and let the light stuff sit outward.
Loosen everything, put the pack on, set the hipbelt so it wraps the top of the iliac crest, that hard shelf of bone, not the soft waist above it. Tighten the belt firmly. Then snug the shoulder straps just enough to contact, then set the load lifters at roughly forty five degrees. Roughly eighty percent of the weight should be on your hips.
Anything that swings costs energy. Compression straps snug, nothing dangling off the outside, water bottles secured. A quiet pack is an efficient pack.
Walk up and down the street loaded. Anything that annoys you in five minutes will be unbearable in five hours.
Heavy and high and against the spine, belt on the iliac crest, shoulders barely snug, nothing swinging. Then walk the driveway.