I'm going to have a go converting my cuben shelters to magnetic door tie backs. Thought it was worth mining the hive mind as to what size neodymium magnets tarp tent etc settled on? The shock cord and cord loc on my tramplite is the best system I've used so far but still a little finiky compared to how easy magnetic closure looks. I'm going to go over my duplex copy and try and redo bits I'm not happy with. My sewing and sewing machine back then were tragic, and 7 yards of cuben deserve better! I'll probably convert it into a tarp by cutting the mesh and floor out too. I wouldn't use it in the midge prone areas anyway, and the floor can be easily converted to a stand alone bathtub that'll clip in should I think polychryo wouldn't cut it.