A backpacking pack is generally considered "too heavy" if it exceeds 20% of your total body weight. For a person weighing 70 kg (154 lbs), this means a maximum loaded pack weight of 14 kg (31 lbs). Going beyond this threshold significantly increases the risk of stress injuries to the knees, hips, and lower back, and leads to faster fatigue. For beginners, a common mistake is overpacking "just in case" items; experienced hikers aim for a "base weight" (the weight of all gear excluding food, water, and fuel) of under 9 kg (20 lbs). If your pack feels like it is pulling you backward or if you cannot stand up straight without leaning forward, it is too heavy. In 2026, with the widespread availability of "ultralight" materials like Dyneema and carbon fiber, many modern backpackers strive for a total weight closer to 10% or 15% of their body weight to maximize their mileage and physical comfort on the trail.