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Most experienced hikers would never recommend trying to carry more than 1/3 of your weight. However, this assumes that you are in excellent physical condition and that the weight is distributed properly on a pack that fits you correctly. If you are 150 pounds, this means that you are carrying 50 pounds if you are carrying the maximum FSO. To truly enjoy your hike and to avoid exhaustion and injury, don't carry more than 25% of your body weight (38 pounds for a 150 pound person) or lower around 20% of your body weight. Also, you need to take into account your physical condition and your readiness for the terrain you will be traversing.