Monday and Friday are the whole of what you know

Navy ground. Five identical drawstring kit bags in one evenly spaced row, each gathered at the neck. The first and the fifth are solid mustard. The three between them are pale outlines with nothing inside. MON sits under the first, FRI under the fifth, and both solid bags carry two stitched initials at the lower corner.

There is no lettering under the middle three. That is not the drawing running out of room. That is the drawing being accurate.

Why are three of the five bags left as outlines?

Because the object passes through your hands twice in a week, and the row is drawn from your side.

It goes out on Monday morning and comes back on Friday afternoon. In between it hangs on a peg in a room you have never stood in, in a corridor you have not walked down. You know it is there. You know what you put in it. You have no picture of it whatsoever, and a solid bag drawn over Tuesday would be a picture you invented.

Why do the middle three carry no day names?

Because lettering them would be a claim the design cannot support.

It would be easy to put TUE, WED and THU under the outlines, and the row would look more finished for it. It would also say those three days are known in the same way the first and the fifth are. They aren't. The information stops on Monday morning and starts again on Friday afternoon, and the lettering stops in the same two places.

What are the two stitched letters for?

They are the part of the bag that has to hold up for four days among thirty that look identical.

Two initials in the lower corner is a small thing to rest a week on, and it is doing the whole job: it is what turns one anonymous drawstring bag on a row of pegs back into yours on Friday. The letters are stitched rather than written because a marker pen on canvas has a shorter life than a term, and this object gets handled by people who have no reason to be careful with it.

Why does kit stay there all week in the first place?

Because what is being managed is a peg, not a bag.

Kit that travels daily is five journeys out and five back, and every one of those is a chance for it to end up somewhere else. Kit that lives there is one journey each way. The trade is that you hand over four days of custody to a hook you have never seen, and everything you put in on Sunday evening has to be enough for that hook to hold up its end — which is the same trade as a change of clothes sealed in September and left there, run at a much faster cycle.

Does drawing initials or a day name need anyone's permission?

Your own initials, your own bag and your own week are yours, and nobody licenses any of them.

MON and FRI are three letters each and belong to the calendar. A school crest is a different case, because it is the school's mark — and schools do license it; that is precisely the permission a uniform supplier holds. So a real crest is available if a real crest is the point, and an invented bag says the same thing about your household if it isn't. Style has no owner. A work does. Another child's initials on a drawn bag is a consent question rather than a licence.

Does it work for something that isn't kit?

Yes — anything that lives away from home between two handovers has the same shape.

An instrument case that goes in on Tuesday and comes out on Thursday, a swimming bag, a coat that stays on a peg all term, a hat that has to be there before anyone is let outside. The design needs two dates you are present for and a stretch in between that you are not. Where the object comes home every night there are five solid bags, no ghosts, and nothing to draw.

What does Friday's bag tell you that Monday's didn't?

That it is heavier and damper than it went. That is the report, and it is one measurement taken at the door.

Nothing in it is itemised. No day is attached to any of it, and the bag does not distinguish between four uses and one — the same problem that turns up when the whole week arrives at once. What you get is a difference in weight between the bag you handed over and the bag you take back, which is why the fifth shape in the row is drawn solid and the same size as the first rather than larger. The change is real and it is not visible.

Does it print well?

Yes, and the two-ink structure is what makes it work.

Solid mustard for the first and fifth bags and their lettering, a single pale line for the three outlines, nothing else. The gathered neck is the only fine detail in the design and it wants to be drawn coarser and with fewer folds than a real drawstring has, because a cluster of thin lines at that scale fills in on the weave. The stitched initials need to sit large in the corner rather than at true scale. Navy, forest and charcoal all hold mustard cleanly; on a pale garment the outlines have nothing to be pale against.

How do I get one made?

Describe the week at JustOG — what goes in the bag, which days you see it, and what is marked on it. Pick a direction, drag the crop frame, see it composited on the real garment, and it's made to order and shipped.

Designs other people have published are in the shop.

From Friday evening the peg is empty. You have never seen it either way.