That's great, another ULer in the making! It sounds like you guys are off to a great start.
I've related this story a few times but every time I hear about a Scout's first hiking trip I think of this episode from when I was in Scouts. Our troop was preparing for our first overnight backpacking trip. None of us kids had hiked and only a few of the leaders had so we were all pretty green. Some of us were savvy and researched what to pack on the internet and had figured out that going lighter was probably better. We did a shakedown hike where we camped at a State Park then loaded up our backpacks and did some short loop hikes and ended up back at the campsite that night. While none of us were anywhere near "lightweight" most of us did ok. There were some laughable things like a kid having an entire roll of toilet paper and one who had one of those giant bags of M&Ms. But the kid that took the cake was a scrawny guy named Brett. He had a massive external frame pack that was loaded to the gills and had all kinds of things hanging off it. Around lunch time we could tell Brett was struggling so we decided to go through his pack. As we're going through it noting that he really went above and beyond the packing list we'd given out weeks before he finally admitted that his mother had packed for him. The thing that stands out most in my mind is the three entire sets of clothes he was carrying. Each ziploc bag had a t-shirt, socks, underwear, JEANS, and SWEATSHIRT. So in total he had 4 complete changes of clothes for an overnight hike. We all got a kick out of that. We ended up dividing up some of his gear among the older, stronger Scouts so he could keep up the rest of the day. Suddenly the security officer at the airport asking if you packed your own bags doesn't sound quite so absurd.