You can bring as much as clothes you want but extra luggage is not required for the trek, you can leave your extra luggage in Kathmandu or Pokhara’s hotel. For the trek you can carry enough clothes you require in your backpack or carry only the camera, water bottle few clothes etc in your backpack. The potter can carry your extra duffle bag clothes which can weigh up to 30kg. However the local domestic flights (Lukla, Jomsom, Juphal, Simikot) allows maximum of 15kg per person including carry-on baggage.
