I use the small original Shop Bag for pretty much everything. I carry it folded in a larger bag (in the elasticized pocket inside my Synapse 19, for example) for overflow of items that accumulate during the day, to use during trips to the store, or to hold my kid's school papers/jacket/lunch box at preschool dropoff and pickup. Since the pandemic began, I have been using it daily to carry my devices, notebooks, and miscellaneous stuff around the house (as I frequently need to move around to accommodate all of us working and learning from home). It's currently holding: a travel mug in one of the side pockets, a 3DOC with small personal items in the other side pocket, a Chromebook (vertically, in a laptop sleeve), noise-cancelling headphones in their case, phone/office supplies/notebook in a small Freudian Slip, and a light sweater. The open top means that everything fits in easily and things can protrude out of the top and I can still carry it. The best thing about the Tom Bihn shop bags, as opposed to the many other reusable shopping bags or tote bags out there, is the handles. They actually fit over your shoulder and are comfortable to carry without slipping off.