There is lots of discussion about the proper amount of weight that a boy can carry safely.It varies wildly, depending on the attitude and strength of the boy.For extended treks the internal frame pack should have a volume over 3,000 cubic inches (50 liters), but less than 4,200 cubic inches (70 liters).
Empty Gatorade bottles are lighter but don’t last as long.
Two flashlights with new batteries: Flashlights with two AA-cell alkaline batteries are good. The “coal miner’s” head mounted flashlight provides hands free use, but weighs more.
) Items you wear are not included in the above totals, nor is food weight (estimated at 1.5 to 2.0 pounds per day, per hiker) or water (which adds 3-7 pounds per hiker).
the three heaviest things are your backpack, tent, and sleeping bag, so if you want to save a lot of weight invest in these items.
Small mouth bottles are difficult to clean and to fill with a water filter, or a drink mix.