To get mobile and to get around in the woods, what I normally do is go by bicycle and a bicycle trailer. My trailer is fitted with drip proof box which contains Lowpro backpack, photographic gear, lunch, water etc...
A few milles into the woods, to be fully prepared, I decided to attached big lens (500mm F4.5) to camera (1Ds) and lay the aforementioned on the backpack, close the lid and go riding some more. I assure you, that when I attached the lens, I heard the "click" which assured me that the lens was latched on the camera mount.
Gee whiz, a half hour later, I open the lid, pick up the camera and to my amazement, the lens (although still attached to camera) was not latched. Believe me, I have'nt got a fiddlers clue as to what happened.
Anybody out there have a similar experience?