Good bag but some improvement needed

In short: it works but the material is really cheap made and some improvements needed. I got this bag so I woudn't have to force my kite to fit to its own bag and avoid excessive folding and compresssion between sessions. Also kite dries better when just rolled. For that purporse the bag works fine. However I don't understand how to use the sholder strap - its designed very odd way. the strap has two parts that are sliding back and forward and only one part has padding. How its supposed to be used? It doesn't work as a shoulder strao and neither as the backpack strap. Second issue - the shape of the bag. its wide at one side where it has opening and narrow on another side. When you pull the bag on roller kite, you need to insert the rear edge of the kite first because it doesn't fit the other way around. If you rolled you kites with bar attached you will have hard way to get the kite to the bag due to lines that are at the rear edge of the bag.