I gave myself a time limit on this one (30 minutes), as I have another day full of stuff to do and I didn’t want to leave the sketch as the last item on the list. I used about 15 minutes.
Reproduction of a milk bottle
Sketch 013, Milk Bottle
Milk Bottle, Sketch 013
It's a long story ... 
I loved the shading on that sketch, Tresha. 🙂