We dont usually wash packs, except to rinse them out with the garden hose if they get saturated with blood or really muddy. I did machine wash the pack bag of Luke's Barney's pack last season, as the lanolin from his sheep smelled so terrible we couldn't even stand to have it in the garage. I took the pack bag off the frame, and put it into a mesh laundry bag (super cheap at Walmart or anywhere, we use these mesh bags for all kinds of stuff! Almost weightless, and very handy), the ran it thru the washer with a little laundry soap on delicate with the double rinse setting. I then washed it a second time on the same setting without soap. We line dried it, and it was as good as new!