What do professional photographers often say NO to? The very things amateurs say “Must Do” to. Like these:

• Camera bags. You do not need your camera in a bag. When it is in a bag, you cannot use it. Your camera is for picture taking, not for storing. I carry a camera on one shoulder, and a bag with lenses, flashes, filters, and so on on the other shoulder.
  
• Filters. A filter will sometimes do more harm than good. In particular, it can increase lens flare. What happens when you are shooting in the direction of a strong light source. So a filter can decrease your quality, while it can never increase it. But does it not protect? Yes – so when I am shooting in snow, rain or a sandstorm I may put on a filter. Otherwise, no. (But note, I always, always use lens hoods. They reduce flare and prevent damage).
• Lens caps. A lens cap is a great picture preventer. Need I say more?

Sometimes, less really is more.

I am not saying you cannot use bags, lens caps and filters. What I am saying is that if like me you choose not to, you should not feel guilty. You may find the experience lliberating.