I only use two types of filters in my photography. Circular polarizers remove reflections and glare and enhance color saturation. Neutral density filters cut down the amount of light reaching the camera’s sensor, allowing for long exposure times which can be used to create motion blur (I use these a lot when shooting waterfalls). Good filters are not cheap and worth protecting when carrying in the field. Many cases exist but they are generically sized and tend to be bulky. I designed and printed this filter case for the ones I like to carry with me. It is lightweight, compact and more protective than most cases I have seen.