Reducing weight when backpacking
Tom - Sounds like a massive miscalculation to start with an 80lb pack on a D of E expedition (maximum 3 nights) - 20kg or 1/3 body weight (whichever is less) should be maximum for teenagers. You can reduce weight by using dried food (no need for special camping food - supermarket muesli for breakfast, noodles / cous cous / flavoured rice / soup for evening meals and savoury biscuits and cheese in tubes for midday, plus fruit, muesli bars, sweets and drinks throughout day etc are fine), efficient stoves and fuel (ie not Trangias with meths), tent(s) shared between several people, appropriate sleeping mat (not a lilo or mattress!) and sleeping bag. On mountain marathons, the leading 2 person teams carry around 10kg between them for 2 days and 1 night out in the hills. Admittedly, that's taking it to extreme, with expensive kit, but for example, I have a 2 person tent, weighing 1.8kg, which I bought second hand for ?80 in 1988 and a larger 2 / 3 person tent, 3.5kg, bought for ?100 in 1994 - and I'm still using both, including when assessing Bronze and Silver expeditions in Shropshire and Peak District, having gained my Bronze and Gold pre diabetes.