-bivvy bag ... for covering youself from weather. helps keeping you warm at night as well
-1 man tent ... these come in very tiny size and weight low as 1,2 kilograms (equals ~2,5 lbs). also you carry bivvy or tent, probably not both
-1 powerbank, kind of type which allows you to swap actual source of energy (18650 3.7V rechargeable batteries). you can carry bank plus couple dozen of these batteries. 1 battery equals ~2/3 smart phone battery charged from zero to 100%
-food ... dry food lowers carried burden. vegetable oils come in great selection, and whats best in oil it carries so much energy per weight. 9000 calories per liter (or per 2lbs). take spoonful every other hour. when you go low in energy, you still have that fat in your system, cause its slow energy. DON'T leave with only oil in your bag, you need sth else to eat ofc otherwise it'll be depression not fun.
- shoes, don't leave with only flipflops. I bet you'll be missing good shoes when you're running away from security ;D
- map
Thats it. I think I could do 24 hourish with these supplies. What ya'll think?