the upper material is thick (would not worry me at all hail actually do) but unfortunately the material side is very thin (which in itself would be no problem) would not the tensioning straps (even worse, by the tight seam) start there - and either minimal to fixed pulling on the belt (even if you already through experience is warned) or a few gusts of wind let the lower case - as specially perforated) almost with "ease" tear - a truly expendable vulnerability on an otherwise really good product at a reasonable price.