It's an entirely different kind of diaper bag.
For a long time, when we had one, normal-sized diaper bag, I was not a fan of the dad bag concept. It was easier to have one gender-neutral bag that was always pretty well-stocked than have to kit out my dad bag every time I left the house. [alternate interpretation: yeah, I was lazy and coasted on my wife's maintenance of the diaper bag. But it was really a purse! That I just borrowed! I mean, she kept a lipstick in it!]
Anyway, now that we have a way-too-big Jack Spade dad's field bag as our diaper bag, I find myself more amenable to just throwing a few diapers, wipes, a bottle, a pacifier, a snack, and a toy in whatever tote bag happens to be hanging around. It's making me a believer in the basics-only school of packing, and in my experience, it really weakens the case for A Diaper Bag for every day.
Which is a long way of saying that if it can hold a bottle and some diapers, and maybe if you throw in a changing pad, you can really turn just about any bag you want into a diaper bag.
And that includes the 5.11 Tactical PUSH Pack from Streicher's Police HQ. PUSH is "short for Practical Utility Shoulder Hold-all," and it also somehow makes it easier for the burly men of law enforcement to talk about what could be considered a manpurse, except it's totally not. It's tactical. Either way, it has compartments for one-liter bottles, and some stuff, and it looks tough and easy to use, or tactical, practical, and utilitarian.
5.11 Tactical Push Pack, available in flat earth dark or black or red, $49.99 [policehq.com via dt reader eric]
Previously: Maxpedition Fatboy S-Type Versipad, changing table sold separately