An apparent  G.I. Joe concept artist, Bobba Vala, has posted some neat art to his DeviantArt page.  Looks like he did some input drawings for the various backpacks for the Best of 80’s Battle Pack (which, incidently, were some of the coolest parts from the set).  Check out his page here, and the images are also mirrored below.

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Thanks, as usual, to Jeff Bohn for the info!