This compact mini matte box is 3D printable at home and holds 4x5.65 cinema filters
SmallRig Lightweight Carbon Fiber Matte Box
NiSi Cinema C5 Matte Box Starter Kit
Nano 4x5 Matte Box Innovative Gear for Content Creators
NiSi Cinema C5 Matte Box Filmmaker Kit (Matte Box, VND 1-5 Stops, 4 Stop ND, Black Mist 1/8, Adaptors and Pouch)
NEEWER Mini Matte Box with a 4x5.65 Filter Tray, Carbon Fiber Flag, 4 Circular Lens Ring Adapters (67/72/77/82mm), Compatible with SmallRig Compatible with K&F Compatible with TIFFEN Filter, PG002
NiSi Cinema C5 Matte Box Cinema Kit (Matte Box, VND 1-5 Stops, Rotating PL, 4 Stop ND, Black Mist 1/8, Adaptors and Pouch)
NiSi Cinema C5 Matte Box Cinema Kit (Matte Box, VND 1-5 Stops, Rotating PL, 4 Stop ND, Black Mist 1/8, Adaptors and Pouch)
ARRI's New Lightweight Matte Box - ARRI LMB 4x5