Small diaper bag

Can anyone recommend a smaller sized diaper bag? All diaper bags that I've found are big. Normal sized diaper bags are hard to get in and out from under my stroller. 
I'm looking for something smaller for outtings that are only gonna be a few hours or less so I don't need to bring my whole big diaper bag. I've looked at babies r us, target, TJ Maxx and haven't found anything yet 

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