Clothing/Shoes/Weather Gear: In summer it can get very, very hot. So prepare to dress for that. Good shoes are needed for hiking the sandstone pyramides and remember that the thoroughfares in the village are sandy trails. The trails to the ruins are also muddy trails.
Luggage and bags:
Just make sure you leave enough room for several wine bottles:) It's good and it makes a a good gift.
Clothing/Shoes/Weather Gear: Comfortable shoes, but do I have to tell you that.
BTW Melnik is in Bulgaria's warmes region.
Miscellaneous: And don't forget, a big smile. The local people are very nice.