Hiked down to Havasupai Falls in college with an 80 lb pack in college....wrecked my knees due to being all downhill. On the hike out it was only 35lb pack since we ate most of the food. Ironically was way easier uphill. Got to the switchbacks and took off sprinting. Don't think I could make that hike today with a 10lb pack. Father Time is undefeated