This bag was designed specifically for the Hostetler 35% RV-4 wing panels. This bag was designed to accept the panels with the dual spars in each wing panel. It has all our exclusive features including canvas/3/4"-thick padding/fleece sandwich, a full-length, custom zipper, pockets for a small hardware box and custom covers for the spars. It also has our that does a great job at protecting wing panels. There is also a padded, flannel-wrapped divider.