No problem! As for the pack, Danny’s parents didn’t give it to him. Tucker actually makes it for him, via some hijacked equipment from Danny’s parent’s lab. It’s only visible when he’s in his ghost form (I figure whatever Danny puts on in ghost mode is only really visible in that form. Hence the changing outfit when he transforms and all.) The only indicator for it in human form is some small, circular scars on his skin where the different pieces connect. But most of those can be covered just with a normal t-shirt. The two on the front of his neck aren’t, but he usually wears shirts/scarves that can cover them. (Hoodies, turtlenecks, collared shirts, etc.)
His parents know about the whole “accident” deal and they know that it had an effect on Danny, but they don’t know the whole situation. They just think it made him very sick for a while (because before Danny figured out he had to consume ectoplasm, he did get really sick from not having it) and that it has altered his mood/general health/ appearance to a certain extent. They don’t know about the whole “turning into a ghost” bit though. They’re suspicious that something is going on of course, as Danny sneaks out a lot, but really, they’re kind of in denial about it.