trying to think a little outside the box and bring new concepts to the market is a great trait of this company. With some effort the kite bag could use a major rethink.
Start with trying to build a bag around an easily folded kite. Like already mentioned the long slightly narrower cylinder bag would fit a rolled and once folded kite nicely. Most of us roll the kite from tip to centre and fold it in three from there. This can trap a lot of sand in the kite and you end up with a centre portion that is slow to dry. Then we cram it in a bag usually with the sandy LE at the top! My six only has to be folded in half and it drains a ton of sand as it completely dries, especially when placed LE/TE down and I end up with a sand pile in the bottom of the bag. Why not build a bag to fit that configuration and drain sand/water at the bottom? A big draw string top would make stuffing a wet or multiple kites into one bag much easier as its a simple shove all the way to the end of the bag. Done! Make the bottom of the bag out of tough material but the bottom five inches of the cylinder side section of tough mesh to drain sand as your kite dries. Maybe a grommet hole in the centre and you will never end up with a pile of sand at the bottom of your bag. Keep the backpack straps and a slightly bigger bar pocket on the side and an external zippered pocket under the logo on the outer of the bag for incidentals reserving the main compartment just for your kite and maybe pump. The bag will be longer than it is now and generally cylindrical so keep the bag going above the backpack straps by about a foot so you can slap a waist harness around it with the spreader bar at the back when walking to the beach. Easier than trying to cram it in the bag and its usually wet and full of sand anyway. Make The whole upper out of the light nylon, but use a tough mesh at the bottom and tougher still canvas as the floor of the bag. The current light mesh is the only area that really starts to fall apart over time. Have has to mend it a few times on bags in the past.
Not a final idea, but wanted to throw something new in the mix