I spent almost NINE years traveling the world full-time. This is how I kept my belongings safe and the lessons I learned from my first and ONLY time having something stolen while traveling.
These are all the anti-theft devices shown:
Travelon Bra Stash (grey):
Eagle Creek Bra Stash (black):
Other products mentioned:
Osprey Farpoint Backpack:
Rebecca Minkoff Julian Backpack:
Please read this post for a full list: