I sell it so I'm a little biased BUT I would recommend the Organizing Utility Tote.  I used one as a diaper bag BEFORE I started selling it so I loved it before it paid to love it.  A lot of the women in my church use the Organizing Utility tote for diaper bags.  I also used the Cindy tote for awhile since I was a FTM (first time mom) that overpacked for everything. https://i.pinimg.com/236x/60/bb/2d/60bb2d02ca34c06a3e9e3ed1b712c6d1---gifts-thirty-one-gifts.jpg
This was especially true when it came to feeding. Originally, I told myself we would breastfeed―exclusively. I had built up the idea in my mind that this was the correct way of feeding my child, and that anything else was somehow cheating. Plus, I love the connection it brought us, and so many of my favorite early memories are just my baby and me (at all hours of night), as close as two people can be as I fed her from my breast. https://i.pinimg.com/236x/09/31/b8/0931b86d4c8918d6fa34123e8f5f4717.jpg
Like a superhero, the B.F.F. bag transforms from an over-the-shoulder tote to a messenger bag to a backpack in an instant. It can take a beating too—its Teflon-coated material repels dirt and stains and is machine washable. And, parents swoon over the insulated bottle storage and memory-foam shoulder straps. But for those who need a ton of space for cloth diapers, twins or pumping equipment, this bag could run small. https://i.pinimg.com/236x/55/71/cf/5571cf7e3f73fda328b33ab763bc7e6a--pure-romance-products-signature-collection.jpg
We ultimately used the diaper bags in nearly 50 real-world settings in two states, including on airplanes, at the beach, at the mall, at Costco, at an amusement park (where birds landed on the diaper bags and pecked at them), and at the zoo, playgrounds, restaurants, a kids soccer game, museums, the doctor’s office, and the pool. Almost all the diaper bags traveled with us during a family vacation to Hawaii, where it was humid, sandy, occasionally rainy, and about 85 to 100 degrees Fahrenheit on most days. We hung the bags on our stroller—which indeed tipped over several times, though luckily not with the baby strapped inside it!—during long walks, and slung it over our shoulders or backs the rest of the time. In the majority of our outings, we changed the baby’s diaper to see how manageable it would be to set up the changing pad and reach the diapers and wipes.
The Baby By Thirty-One City Park Diaper Bag in Whisper Grey is a part of the new Baby by Thirty-One line and is way more than a diaper bag! All the functionality of a large diaper bag, but with the modern style of an urban tote. Lots of interior and exterior pockets, including a thermal zipper pocket and hidden cell phone pocket. Carry it as a tote, or sling it over your shoulder with the adjustable crossbody strap. 
Comfortable to carry. We looked for padded straps, good balance, and a low weight. We took a skeptical eye toward bags that, when empty, weigh more than 2 pounds (we did make a few exceptions). Comfort is subjective, and we wanted to find options for people who find backpacks or messenger bags more comfortable than shoulder bags. Bonus points for bags that could be carried in multiple ways. https://i.pinimg.com/236x/c1/cc/0b/c1cc0bc7a6db74f4b7a3cfc4281bfd06.jpg
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