Description Canvas Corp Burlap Envelope has a “V” shaped flap and finished interior seams. Relatively fine weave burlap, about 20-30 thread count, in natural “Kraft” color. Yes it could be an envelope for hand delivery, NOT mailable, but it could be so many other things. Canvas Corp – Burlap Envelope Contains one 5×7 inch burlap envelope 100% Jute Canvas Corp – Burlap