If I want to prevent theft while traveling abroad and...
* don't care to use a neck strap
* it's a DSLR I'm carrying
* and lots of walking is involved
then I'd seriously consider the Cotton Carrier Vest with a very light and breathable photographer's vest designed for warm seasons. The benefits are:
* it's right in front of you, which by in itself not an easy target, and no one can get it off without making a specific turn from the right angle
* it leaves you hands free
* great when long walking is involved because of perfect balance it provides, saving you from neck or shoulder aches
I have a Herringbone handstrap always on my camera, and it complements the CC Vest very nicely. I also have the SpiderPro Holster, but I use it primarily for my studio work or where short walk is involved or event shootings. I wouldn't use it where a long walk or all day shooting is involved due to weight imbalance.
If I'm carrying just a mirrorless camera or something as light as that, an option is to go with the Peak Design CapturePro and carry it on a backpack strap. Unless someone steals the backpack itself, no one can yank it off.

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