Large Diaper Bags Can You Recommend A Good Diaper Bag For 2 Babies? And What Do You Think Of These Diaper Bags?

Can you recommend a good diaper bag for 2 babies? And what do you think of these diaper bags? - large diaper bags

My child is about 12-13 months apart and I am looking for a diaper bag good for them. I do not know what is best: a backpack, a large diaper bag, a diaper bag set (1 lg, 1sm, so that their cases are not included) ... idk. Suggestions or links.

Preferably, unisex.

So, what do you think of these groups: (I myself can not decide)

This clock is unisex?
http://www.walmart.com/catalog/product.d ...
This bag better?
http://www.walmart.com/catalog/product.d ...
It "" I am currently enrolled in ...
http://www.target.com/Eddie-Bauer-Davenp ...

I'm worried I'll have one, is not big enough. Or what is a nuisance for everywhere. Opinions, ideas? Thanks