My first absorbent underwear:
When I was thirteen or so, I was visiting my aunt and uncle with my parents. My uncle had bought a pack of peach colored Depend pull ups as a joke for one of his coworkers. For some reason, he asked my dad if he wanted it (which was a bit odd since my dad is not IC). My dad accepted and said he would keep it in his truck for emergencies. We got back home, and after everyone went to bed, I went out to his truck and took them for myself. I had them hidden under my bed, and I would triple them up and wear for comfort most nights But on a rare occasion, if the house was empty, I would use them the way they were intended. This way, I could maximize usage, and it took me over a year to use them all.
My first actual adult diaper:
I was nearly seventeen when I got my drivers license. While my mom was camping with my dad, I borrowed her car and got some Depend Protection with Tabs from Walmart (This was back when they sold those in the stores). They were a good diaper for my usage, even though I had to double up most times. I also really loved the plastic backing on them.
My first good adult diaper:
When I went off to college last year, I was finally able to receive packages and not have to worry about others snooping. Needless to say, I went a little overboard with ordering things like adult pacis and onesies. I used this opportunity to get some real diapers. Those being Abena M4s. These things were fantastic. And thick! I really enjoyed them, and I am never going back to brick and mortar diapers again. There goes my textbook fund!