It is important to work out a routine of taking camera out of a backpack and putting it back. Routine will turn into habit that will ensure that nothing gets broken or lost over time.
I realized this after one incident while photographing in Yellow Stone National Park. One time I though I would leave my camera backpack open in the trunk of my car. I thought why bother opening it and closing every time I need to reach for a camera.
Then I was in hurry to catch a sunset and I completely forgot that I left my backpack opened. I needed to run to get a better angle for a shot. I quickly pulled the backpack out of the truck and threw it at my back. That sent my DSLR and filters flying out of the backpack.
I was very lucky that time – my camera landed onto a level inserted into the camera hotshoe. The level was crushed but it saved the camera – it did not have any damage. Needless to say that I did not get any sunset shots that time.
That taught me an important lesson not to skip on important routine of packing camera after doing photography. The lesson cost was $25 – the cost of a new level.
I have similar routines for extending/collapsing tripod legs, placing camera on tripod, for placing and removing a filter, changing lenses. These routines are very important. Eventually they turn into habits that you do very mechanically, so you can focus more on photography instead of these small things.