I seriously need to invest in that. I got all my accessories in ziplock bags and it's not very organized.
The larger container could be anything(Or even a cardboard box, or a drawer), but the smaller ones are "Really Useful Boxes", and are really pretty cheap. I mainly use .07L(https://www.reallyusefulproducts.co.uk/usa/html/onlineshop/rub/b00_07litre.php), .14L(https://www.reallyusefulproducts.co.uk/usa/html/onlineshop/rub/b00_14litre.php), .35L(https://www.reallyusefulproducts.co.uk/usa/html/onlineshop/rub/b00_35litre.php) and .7L(https://www.reallyusefulproducts.co.uk/usa/html/onlineshop/rub/b00_7litre.php) sizes but i have loads of larger boxes for various uses, as seen above. It's the 1.5L(https://www.reallyusefulproducts.co.uk/usa/html/onlineshop/rub/b01_5litre.php) box that has all my weapons in it, and i have two 1.75L(https://www.reallyusefulproducts.co.uk/usa/html/onlineshop/rub/b01_75litre.php) on top for other storage. The main box i have my heads in is an 11L box with an integral(But removable) 6 way divider tray: https://www.reallyusefulproducts.co.uk/usa/html/onlineshop/rub/b11_0litreXLLDT06.php
They are a UK company but they have a US distributor.
https://www.reallyusefulproducts.co.uk/usa/html/boxdetails.php