Here is a sample packing list for a trekking trip, courtesy of Explorandes.

Adventure Gear for Trekking
• Cotton short-sleeved shirts or t-shirts
• Light colored long-sleeved shirts
• Fleece or Wool sweater and/or trousers
• Lightweight pants
• Hiking shorts
• Regular and long underwear (at over 13,000 ft/4,000 m. asl)
• Medium weight parka with fiber fill or down.
• Light cap and wool hat,
• Rain poncho (or rain gear)
• Light gloves
• Medium weight socks
• Tennis or running shoes and hiking boots
• Trekking poles (optional)
• Sleeping bag (0o to –15oC) and small day pack
• Strong waterproof duffel bag
• Sun glasses
• Sun block, lip balm and Insect repellent
• Flashlight with spare batteries and bulb
• Towel
• Swimsuit.
• Water bottle.
• Personal first aid kit. On each trip we carry a medical kit but we suggest a small personal first-aid kit for bruises and blisters. A knee and ankle brace are sometimes useful especially if you suffer from weak knees or ankles. Include any special medication your doctor might suggest for you.