Slick. Please update on how it fares at the event.
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I made a update to the main post, but I will update here too.
They were good, but the quality of the bags themselves were obviously cheap, and one of the two bag I tailored up, broke down on the lower strap loop. I probably could return it, but it might just be easier to sew back down.
The LEDs though were a godsend. The event I went was a night and at night finding people was so, so easy. We split up and try to find each other again, just look for the person with the glowing bag. It also was bright enough that I was able to see the specific color of candy I wanted in my bag, and illuminate friends for photos.
Making more bags if we go again so everyone has one.