Luggage and bags:
Day sac to carry stuff you might need
Clothing/Shoes/Weather Gear: comfy shoes for climbing to the summit of the prison and walking around the sites. Loose fitting clothes, (it's quite exposed to the sun )
Toiletries and Medical Supplies: Carry prescription medicines -I'm not sure if there is a pharmacy in Takab.
Sunscreen - it's pretty exposed
Photo Equipment: All you can carry! again, not sure if there are shops in Takab to re stock with batteries, film etc.
Miscellaneous: Walking pole for those with dodgey knees (like me) for climbing Zendan-e-Suiliman
The region is very cold in winter & even chilly nights in summer.
I recommend to have suitable Clothing & shoes for climbing.