At the front company phone covers (atthefront.com) are made of American material dating back to World War II.
The product is a cross between an M1 rifle magazine pouch and a .45 colt magazine pouch.
Covers will fit iPhone plus and Samsung NOTE 10 phones. AR15, BAR, AK, Thompson and Sten magazines do not fit.
Dimensions: 17.1cm x 8.9cm x 12.7cm.
The cover is attached to the belt in a traditional way with a loop/sleeve. The covers are made in the USA and cost 39.99 USD.
Sources: soldiersystems.net, atthefront.com