I have this:https://www.amazon.com/Timi-Leslie-Canvas-Backpack-Designer/dp/B004CR31OO.
Originally, I loved it, but now it is fraying (already!). Its also pretty cramped inside, too many pockets which just eat space. DH was shocked at the price tag (not bad if you ask me!), so I can't spend too much on another. Who loves their bag? Bonus if its easy to babywear with!
Re: Rec. Your <$100 diaper bag
I have three. One I bought, and two I was given. All three are different sizes, so I use them or other occasions.
This one:
https://www.walmart.com/ip/Amy-Michelle-EcoBaby-Tote/13371693?findingMethod=rr
Its good for running a few errands, really only holds like 2 bottles, a change of clothes, 4 diapers, wipes, and a burp cloth. Anything else makes it too full.
This one:
https://www.poshtots.com/diaper-bags/diaper-bags-by-style/messenger-diaper-bags/venus-roll-backpack-diaper-bag/1377/2161/2402/24637/poshproductdetail.aspx
Seriously fits everything, and could be used for an overnight visit. Ive been able to fit 6 bottles, 3 changes of clothes, a ton of diapers, and a fleece blanket. And I love how diaper changing friendly it is, with a changing pad that zips off the side, and a separate pouch made for dirty diapers.
And this one, which I bought myself:
(the waverly bag) I do love this bag, but the material gets dirty very easily and Ive already had to take it to get it cleaned.
https://www.coach.com/online/handbags/SearchResultsView?storeId=10551&catalogId=10051&langId=-1&quickOrder=yes&searchKeyword=diaper%20bag&cacheKeyword=BAG%20DIAPER
I recently got this one and really like it. It has plenty of room and the material is soft ( I hate stiff bags)
https://www.toysrus.com/product/index.jsp?productId=4285962&CAWELAID=624292479
This is ours. I picked it out, which shocked DH because I usually go for something super cute over super functional. It's held up fantastically so far and there are straps near the top handle that clip onto a stroller. LOVE it. Not that adorable, but for functionality it can't be beat. It also has an insulated pocket for keeping a bottle of breastmilk cool til you need it.
https://fbcdn-sphotos-a.akamaihd.net/hphotos-ak-snc6/180436_10150176026321110_696446109_8525698_1406919_n.jpg