I'm halfway through acquiring the stuff I need for my travels. My biggest concern is the security of my stuff, especially on long haul train trips for example. I've found a website called 'pacsafe' which seems to have some great anti theft devices, but when I saw some of them in person I was surprised at how heavy they are. I was wondering if you think any of the below products are worth having. And especially if you had another, more light weight but equally secure (eg, slashproof) product that works for you? All suggestions gratefully investigated!

1) The adjustable cable lock is quite heavy but it looks like the safest way to secure my bag to something.

2) The standard cable lock seems a bit small to secure my bag do you think?

3) Another website suggested a travel wallet with chain as being safer, but I tend not to wear belts so is it an unnecessary security measure?

A simple bike combination lock. Available cheaply in your local bike shop. You can then attach your bag to the railings or luggage rack on buses and trains and in hostels if you are worried.

But more importantly I think, don't carry anything of value in your big rucksac. If it goes out of your sight don't put valuable things in it. Put your dirty smelly clothes at the top of your pack. Then if, as invariably happens, people go through your luggage on a bus, all they find is your stinky dirty pants. Which I would hope would put them off. Keep all your money, travel docs, camera etc. with you and either wrap the strap around your legs, or keep hold of it. A lot of thefts happen when people aren't watching their luggage.