How do you keep your stuff safe while backpacking?

To be honest, it's extremely rare that I've had anything stolen. Much more often it's my fault – I just forgot to bring something with me!

But that said, theft is always a concern.

I'm wondering what strategies backpackers can use to keep their stuff safe from theft.

Here are some that I used on my backpacking trips:

• Always bringing valuables with me but leaving cheaper / easier-to-replace items at my accommodation to lighten the load.
• Travel insurance sufficient to cover theft of my belongings.
• Keeping belongings at accommodation out of sight and hidden, e.g. on top of a large cabinet or under the bed.
• Keeping belongings in secure storage at accommodation. Some hostels provide this.
• Keeping belongings in a padlocked backpack. Not infallible, but deters casual theft.
• Keeping belongings in a hired car, locked, parked somewhere safe/convenient.
• Using AirBnB, where the reviews system tends to deter theft at least by the owner.

Any thoughts or ideas to add?