*********************************************************
Nope, you're not doing anything wrong! LOL! I have a huge Juicy Couture Diaper bag that I got Last year, and I love it, but it's exactly that huge! LOL! I carry 3-5 diapers (depending on my trip), 1 extra outfit, wallet, travel wipe case, Sippy cups (for my other 2 son's), and a toy or 2. LOL! oh wait! You forgot the formula dispenser (if you are not going to Breastfeed!) Get it at babies r us, it's 3 sections and it holds up to 8 oz each. I loove them! You got it all planned right! LOL!
I'm nursing so fortunately, no bottles for me atm! I've heard nothing but raves about the size of this bag. Maybe I just have to break it in! I'd still say get it!!!!!