I'd noticed that the label on my Montane Toasty jacket from a couple of years ago recommends spray-on but the newer stuff (Prism & Flux) suggest wash-in. All Pertex outer + synthetic insulation so why the difference? Very odd, or maybe just a cock-up on the labelling front.
Got and still use a 30 year old Karrimor Joe Brown extendable rucksack. Was way ahead of its time when new and still compares well with a modern climbing sac (except it is made of extremely faded blue canvas and has a detachable hip belt instead of a fixed one). Great piece of kit that's been everywhere.