What are the actual options on Khao San?
Three tiers. (1) Hostel-arranged service — drop bag at hostel reception in the morning, hostel coordinates with their partner laundry, returns 24-48 hours. Cost: 50-80 THB/kg + small hostel markup. (2) Walk-in laundromat — you carry laundry to a shop on Soi Rambuttri or Phra Athit, drop off, pickup 24h later. Cost: 50-70 THB/kg, time cost: 1-2 hours of walking. (3) Pickup-and-delivery (us) — we collect from your hostel, return 24h later. Cost: 200 THB/kg + 100 THB pickup. The price gap (60 vs 200 THB/kg) seems large but the comparison is more nuanced.