Growing up, groceries came in squared off brown paper bags that had to be held in one's arms. They were reused to take out dry trash, cut to form book covers - that I could then doodle on in class, or wrap the occasional package to be mailed to a brother in the service, or the other one at college.
We've been using our own bags since our sojourn to Boston. Easier to carry cloth bags when walking, or pack them in a wheelie cart, where plastic bags would fail. We just got in the habit, one that stuck. Dealing with plastic bags in small apartments is bothersome, they are inadequate for garbage, although I used them as such for many years. Three of these have "Trader Joe's" on them. One is insulated, good for milk gallons in summer. Two came as part of a work gift, with a trunk organizer.
Amazing how often baggers just don't know how to deal with them. They expect me to just hold the milk jug. They pack dry goods in the insulated bag, and pack all the heavy items in the largest bag. I much prefer to pack my own, most of the time.
Moby can eat wherever he likes.
And bathe on the laptop, as the mood takes him.