Hi Virginia your list looks good overall. It can and does usually snow at some point during the summer in the SI mountains. Can also be blazing hot with little shade. I would suggest adding tp and packing it out. There's one plant in particular, our native nettle that is pretty harsh. Aside from environmental care as well. Also are you carrying a hat and/or gloves and anything for wind burn? Good luck with everything and I hope you enjoy your hike!