Need some input

To keep my doors on the Road Foamie from flying open and closed and slamming into the body and stressing the hinges, I want to anchor them with 5# sandbags. I'd tether the doors to the bag with a strap or rope and I have enough canvas to make the bags and enough sand to fill them. So here's where I need your thoughts. I can't sew the seams since our sewing machine isn't heavy duty enough especially once they're filled. I was thinking about gluing the seams. What kind of glue should I use? I doubt that TB2 or GG would hold a 5# bag closed. Maybe there's a better method I didn't think of... Thoughts?