Needed a panel to keep my 72 hour emergency bag organized . Found https://www.thingiverse.com/thing:4279349 and although it was the perfect size, I wanted a lil more versatility . Adding the slots allows for weaving of shock cord for easy attachment of various items. Found that the panel will fit in just about any decent sized backpack. I'm using a cheap Bass Pro Shops sling bag and I can fit 1 in each of the big pockets strapped with various items.