I used the 64" wide stuff, the 72" should work, though... it says: "1.1oz (30d) Ripstop Nylon. 72″ wide. Calendared. 2nds Quality. LIME GREEN" though LIME green is pretty bright for my tastes... the key here is CALENDARED!
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I get the usual stuff from DIY Gear Supply - Olive Green calendared/downproof 2nds for the inner shells and DWR Olive Brown calendared/downproof for the outer shells.