>>74050Define "7-30day trek." Will you be resupplying, and if so, how often? What season and what are the expected conditions?
Personally, I consider about 10-12 days' worth of food to be the limit of carryability, and for trips much longer than that, I just plan on resupplying around the 10 day mark. Consider the following: if an average amount of food for a single person to carry, per day on a backpacking trip, is 2 pounds (this will vary per person, but the figure has been floating around the backpacking community for some time, so let's just run with it), then 7 days of food should weigh about 14 pounds, and this is regardless of the type of food you carry; 14 days = 28 pounds; 3 weeks = 42 pounds; and 30 days? 60 pounds. Again, this is assuming you can even fit that much food into a backpack that can be carried on a person's back.
In addition, you still need to take into account the weight of your gear. For a lot of people using non-UL gear like the backpack pictured, the weight of just your gear ?(no food or anything) may weigh in excess of 20 pounds. Stove fuel weight will vary widely depending on your stove, but needs to be taken into account. The average amount of water you'd be carrying in the day is worth adding in, considering that 1 liter of water = 2-1/4 pounds. Plus, add in any other exhaustible supplies, like sunscreen for instance.
I'll let you do the math, but the bottom line is that a backpack, fully loaded for a "30 day trek," isn't going to be very fun to carry.
