*shrug* I can point you to many examples of those bags ripping and tearing under that stress. Typically when they are fully loaded to the brim. You're lucky!
Anyway, i got some em3ev bags in a while back and had a chance to do a serious comparison. The em3ev bag is good, really good. It's got these elastic flaps over the wire holes in the front and back, which will do a much better job of keeping water out. It's got super long velcro straps to attach to the frame, so it will fit super wide tubed aluminum frames better ( i had to cut some of it off on my chromoly bike! ) I see how the battery straps inside could be really useful if you have a nice composite battery, but they aren't really needed for my RC Lipo.
Oh, and it doesn't have that stupid green logo on it. If you were really determined, you could get the em3ev logo off.
So basically, a better bag at roughly the same price.