A stay at Crater Camp is usually only offered in combination with longer routes. This allows enough time for proper acclimatization and thus decreases the risk of altitude sickness.
It is also important to check with your tour operator whether hyperbaric chambers will be provided for your climb. This is not a luxury but a real necessity if you stay at Crater Camp, as immediate descent in the case of altitude sickness is not possible.
To further prepare yourself, please have a look at the Altitude Acclimatization & Sickness section on the Climb Kilimanjaro page.
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