A good idea also is to .. (Score 1)

2 things not mentioned in the good advice above. Type up ALL passport numbers, device serial numbers, traveller cheque numbers drivers liscence number etcetc and print it as small as is legible. You'll be surprised how small the printup can be! Cut the printouts to the smallest size and put one in you main pack, one in your shoulder pack etcetc and leave a copy with friends and family. If worst comes to worst you will always have a ready copy which can save a lot of hassle. Write down what the photographs are about -- keep a quick log. It takes little time and WILL be very useful in the future. After a few years you WILL refer to it and be glad! Enjoy!