The binoculars are stored on their side in the functional sidebag, so they are at your fingertips and ready to use as soon you reach into the bag. The medium size is suitable for NL Pure 32, EL 32, EL Range 32 and SLC 42. The  large is suitable for AX Visio, NL Pure 42, EL Range 42, EL 42 and NL Pure 52.