Unique 39+ Gig Bag Acoustic Guitar Concert Size. Cahaya 41 inch acoustic guitar bag 0.35 inch thick padding waterproof dual adjustable shoulder strap guitar case gig bag with back hanger loop, black. Road runner avenue series acoustic guitar gig bag red honeycomb. 270 results for acoustic guitar gig bag. We're looking at a black bag with a total size of 41.3 x 16 x5 inches (105 x 40 x 13 cm), which makes it suitable for all guitar sizes below 41 inches.