can store 10 filters 100mm by 150mm max plus the filter holder, and rings. The cover can file a belt or the camera bag with a Velcro fastener size a flange. A lintérieure the filter door is removable, which allows to classify, clean and store easily filter back shooting. However, it is not accidentally out of the pocket in normal use, since it is below with a Velcro that attaches to the bottom of the pouch. Thus the cover it can be used to carry accessories, if the filter holder is not used. Excellent value for money.