Loved the backpack. Used with my son and will with this one. Makes for more hands free.
I have a backpack diaper bag and I love it. We have the Baby Boom Spaces and Places backpack from Walmart. It has lots of storage space and it's easy to carry. I used a regular diaper bag with all my older kids and I wish I had gotten a backpack one sooner. I like that it doesn't slide off and it makes carrying the carseat so much easier.
We used a regular diaper bag, then ended up getting a back pack when she was around 1.5. I love the book bag. We're gonna use the backpack for this baby.
I've used both and I love the backpack. We got a actual diaper backpack, but we should have gotten a regular backpack with a lot of pockets. I find that I run out of space and number two isn't even here yet! When number two comes around I'll probably sell this one and just use another one that I have.