Rucksack

A Rucksack is a type of backpack carried by Military personnel. It is sometimes referred to as a "Ruck", "Pack" or "Sack" with "Ruck" being the most common.

Contents
A Rucksack typically contains shelter halves, stakes, water, medical supplies, clothes, ammo, knives, food and anything else you can think one might need for a certain period of time. One thing I recommend are vacuum seal bags. these allow you to pack a lot into a little amount of space, especially clothes. It will aslo protect them from air and water exposure. There are many different styles of these. I personally have prepared a 72 hour bug out bag, but there are 24, 48, 72 hour etc... as well as some different styles. Test them out and see what feels comfortable to carry for long periods of time and suites your survival needs.