This set of six "push on" filters fits over the lens of my DJI Action Pro 5 snugly. It takes some effort to push them on (and pull off). They won't accidentally come off. They come packaged in a flat (0.75" thick), but relatively large (6.25"x6.25") plastic & fitted foam case. This case is too large to fit inside any of my "action cam hard cases" as is, but you could re-package the lenses if you found a suitable "accordion fold" style holder.My DJI action 5 pro does a relatively good job changing the shutter speed to accommodate a wide variety of lighting conditions, and because of this the videos with the various ND filters look somewhat similar to each other. (Longer shutter times as you get up to the higher ND numbers may introduce motion blur where you wouldn't normally have it.)There is a visible difference between the normal lens without a filter, and with the polarizing filter attached. But just having played with them casually, I haven't found a use case where the filters are actually necessary for my Action 5pro to delivery good videos. So if you like to have options, or have a specific need for a ND or PL filter, they are nice to have on hand, but if you are trying to decide if you need them.....you probably don't.