I actually have a feeling that Jason might have been a bit too eager and packed too much (he's like me).
I remember an interview with Nathan about how he brought way too much to PYC because you already get so much beforehand so he had trouble fitting all the things he wanted to bring back home in his luggage... which was the first thing I thought of when I saw that photo of Jason's luggage.

But then again, maybe this is actually pretty normal with all their equipment and gear they get... so who knows?!