This is a Magma grill regulator storage bag offered for sale at $25 via Paypal.
The material is Sunbrella Supreme, in either Captain Navy / Linen or in Linen / Linen. The edge binding is either Captain Navy or Linen. The snap is Captain Navy, Linen, or polished stainless.
says the: "Venturi tube should be stowed with valve in a clean dry environment when not in use."
This valve bag permits proper storage.