A lot of the Hobie Wave sails have the bottom batten angled down from a few feet up the mast to down and aft to the clew. This was a innovation by Randy Smyth, knowing the Wave had no traveler and no vang to keep the clew down.
It made rolling a bit cumbersome.
However, we discovered that by grabbing the lower batten at the luff and rolling, the sail rolled up really nice.
The angled top batten for the square-head could either be pulled out, or folded over to put in a bag.
Rick