Clothing/Shoes/Weather Gear: Kazbegi is well known in the region for being a gorgeous place to trek and despite the surrounding hills looking like they would be on an elementary level they are not. Trekking up to the church is easy enough because there is a road that winds through the villages and eventually up the side of the mountain but getting down to the village from the opposite side of the church def requires sturdy hiking boots. I recommend above the ankle because due to weather, the path can be slippery from rainfall. Also, I highly recommend taking a few warm sweaters, socks and toque from Tbilisi (most leave their gear in the city and do a few days trip to Kazbegi) and then retrieve when they arrive back in Tbilisi. Kazbegi may look warm during the morning and afternoon but believe me, when night falls the temperature drops dramatically to the point of freezing (late September to early November). Be prepared :)
Luggage and bags:
A torch/flashlight may prove useful when electricity runs out at night.
Clothing/Shoes/Weather Gear: For the walk to Tsminda Sameba plateau, bring a raincoat, water and some food. Once you’re there, you won’t want to leave too soon, and the fresh air will make you hungry within t he hour.
While you could get hot treking up the mountain, once you get to the top, the weather changes dramatically. If I had it to do again, I would have made sure that I had lightweight and warm, and windproof gear. Also, hiking boots would have helped somewhat.
The weather seemed to change in Kazbegi by the hour.
Photo Equipment: I don't know if you can buy batteries for your camera there. (And, don't know about film, if anyone still uses that.) Make sure you have plenty of both, since the scenery is stunning.