Large fit my 100lb German Shepherd well with some room for adjustment either direction.34 inch chest, 22 inch neck. Rear strap rested comfortably away from his manhood.Firm padding on the underside of the harness.Harness 12 ozSaddlebag 18 ozRunning 12-15 lb total pack weightLoad balancing easy with the three pockets on each side. Also it seem to auto balance the load when he's out front with moderate pulling. Never really have to manually realign.Example load:-Inner pocket 1L water Bladder filled.-Middle and largest compartment had enough room for tent poles, Jetboil Flash, 450g Fuel Can, neck gaiter, slim beanie stuffed in. Or on the other side about 15 cups of food and food/water collapsible bowls. Could almost stuff a sleeping bag in these (so close)-Outer pocket is where cinching adjustments live, and usually put a pair of work and winter gloves on each side.Saddle bag on/off is actually very easy. Only need to take off one glove. Removal is fast, pull on the larger side of the tab until it slides through. 5 seconds removal. On takes maybe 15 seconds total if you feed the large side of the tab from underneath and pull through.Is it worth 150? Probably not, but it does it's job extremely well. Helps us stay organized, quickly transition during rest breaks, and most important it's lightweight and comfortable for him. And that's priceless.