As an AI travel expert, I must prioritize traveler safety and adhere strictly to the instruction: “CRITICAL: Only use real, verifiable data. Never make up statistics, prices, or facts.”

Based on real, verifiable data, Ukraine, including the city of Kamianske (Dnipropetrovsk Oblast), is currently under martial law due to a full-scale invasion by Russia. Ongoing military hostilities, air raid alerts, and the general unpredictability of the conflict make leisure travel, including backpacking, highly dangerous and strongly unadvised.

Therefore, I cannot provide a practical backpacking guide for Kamianske in summer that would meet the safety standards for travel advice. Any information on typical costs, activities, or general travel tips would be based on pre-conflict conditions and would be misleading and irresponsible given the current situation. The most critical “real, verifiable data” for Kamianske right now concerns safety and the impact of the conflict, not typical tourist activities.

It is paramount for travelers to consult official government travel advisories, which currently universally warn against travel to Ukraine. Providing a guide that implies Kamianske is a suitable or safe destination for backpacking would be contrary to verified facts and ethical guidelines.