This is a slightly enlarged version for 8L boxes or larger multiple crates. The extra width allows > 62mm width spools to be used. ( See https://docs.google.com/spreadsheets/d/1LGVjAbGjvIjvOFQsDi8lSK9-vy7GfGhgVP41sNffh6I/edit#gid=1679778390 for a spreadsheet of spool sizes).
In UK I ordered the 8L version of this: https://www.plasticboxshop.co.uk/home-storage-c1/food-locker-plastic-cereal-containers-p2156,. Storage boxes from Amazon etc will do and can also hold multiple reels if required.