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Possible Uses for USB:
In the event of an emergency there is some documentation that you would want to have readily available and readily visible. Some sort of photo ID might be a prime example.
A map of the area could prove invaluable as would be a list of family phone numbers and contact information.
Photos of your immediate family members could assist authorities and others in locating any of those members who might become separated from the rest of your group during the initial stages of the emergency.
The time to ready all of these papers, of course, is not during an emergency, but before it.
Crazy Flash Drives
The answer lies in those little devices popularly known as flash or thumb drives.
They eliminate the space problem. They eliminate the weight problem.
Your 72 hour kit can easily accommodate a flash drive which will take up no more space than a small pen knife or a pair of nail clippers.
They are that tiny. Yet, they are large in capacity. Newer models can now hold several gigabytes of information, meaning you could, if you wish, fill them with an entire encyclopaedia's worth of information and still have room to spare.
You will need a computer. You will need a scanner or a digital camera. And you will, of course, need that flash drive.
Scan or photograph them using a digital camera. A scanner is the best option in most cases.
Repeat steps three and four with additional drives if you wish multiple copies.