Here's a medium Grocery Bag made from this version of Robert Kaufman's Railroad Denim and this print from Gina Martin's Wing & Leaf collection for Moda.
I've had a few of the fabrics in the Railroad Denim collection and they are all great. This is 7.5oz denim, so it's on the lower end of medium weight, and is somewhat crisp. It will probably soften up after washing a few times. The stripes are dark blue but look almost black in the photos.