Packing for the K2 Base Camp trek requires balancing lightweight packing with extreme mountain weather preparedness. Temperatures on the Baltoro glacier can swing from +25°C under the blazing sun to -15°C inside your tent at night at Concordia.
The 3-Layer System
Always rely on a high-wicking synthetic or merino wool base layer, insulating fleece or down mid-layer, and a rugged Gore-Tex waterproof outer shell.
Footwear Matters
Your trekking boots should be rigid, waterproof, well broken-in, with aggressive Vibram soles.