Duffel, daypack, dry bags: what bags do I need for Kilimanjaro, and what does the porter carry?
What bags do I need for Kilimanjaro?
Two bags: a daypack of 25 to 35 litres that you carry, and a duffel bag of 70 to 90 litres that a porter carries, kept under 15 kg and locked with a small padlock. Anything you do not need on the mountain stays at the hotel, where operators lock luggage in a store room until you return. The Kilimanjaro gear list has the rest of the packing.
The full answer, kept up to date: What bags do I need for the climb?