<human>: Most (if not all) [hiking backpacks] have a top panel with just a draw string securing it close that isn't lockable and single zips all over the bag that aren't lockable. How are you guys keeping your valuables safe/keeping people out of your bag?

I know most people will say:

- "If they want to get in your bag, they will". I understand that but I want to make it difficult for people to gain entry to my bag. 

or 

- "Don't take valuables with you on your travels". 
The only valuable I take is my DSLR for obvious reasons. And I know the safest is to keep the DSLR with me at all times but I can't in instances when I go for drinks/party at night.

Summarize the given text in a few sentences.
<bot>: Owners of hiking/trekking backpacks, how do you keep the contents of your bag secure and limit access to outsiders?