Snoqualmie Pass is a popular ski area, but during hiking season you will meet lots of PCT longdistance hikers in this area. The "Summit Inn" is the only place that is open in summer time for a stay. You can send packages here, but they will charge you at least 15 Dollars, even if you book a room. Just next to it, there is a small general store with basic resupply option and good pizza (they do have gas cans), a gas station, a café and a brewery. Technically, everything a hiker could need. The next outfitter is based in Cle Elum, half an hour east of here (by car).