On a trek in the Markha Valley of Ladakh, India,
I used a photo vest with a LowePro Orion AW fanny pack/day pack. I
could easily unsnap the fanny pack from the day pack, swing it around
in front of me and change lenses in a snap. I prefer it over photo backpacks
that have to be taken off to reach gear. The photo vest is handy for
keeping filters, film and small lenses available.