Nobody plans to buy two ring boxes. It happens because the two events have different requirements and the proposal comes first, so the decision gets made before the second requirement is visible.
Here is the whole decision, in the order it actually arises.
They pull in opposite directions, which is the root of the problem.
| The proposal | The ceremony | |
|---|---|---|
| Rings to hold | One | Two |
| Priority | Hides flat, opens one-handed | Looks good in photographs, passes between hands |
| Who carries it | You, in a pocket, for hours | The best man or ring bearer, briefly |
| Seen by | One person | Everyone, and the photographer |
A single-slot box does the first job well and cannot do the second at all. That is the entire reason the second purchase happens.

Two slots: use one for the proposal, both at the ceremony.
At the proposal you use one slot and leave the other empty — the box still closes flat and still hides. At the ceremony both slots are full and the rings sit side by side rather than stacked, which is what makes them photograph clearly. Afterwards the same box holds both rings on a bedside table.
One object, three moments. The only compromise is thickness: a double-slot box is wider than a minimal single, so if absolute pocket concealment matters more than anything else to you, see the two-box case below.

Two boxes are a deliberate choice, not an accident — when concealment and display both matter.
There are three situations where buying two is the right call rather than an expensive accident:
Buying on looks alone. A single-slot box photographs beautifully in a product listing because the one ring sits perfectly centred — and that is precisely the configuration you will never use again after the proposal.
Before ordering, ask the practical questions in this order:

A window lid means the rings are visible before the box is opened — and stay visible on the shelf afterwards.
Two practical effects, both easy to underestimate:
Buying twice is not catastrophic — it is roughly the price of one dinner out. But the second box usually arrives under time pressure before the wedding, which is when engraving lead times bite. The argument for getting it right the first time is calendar, not money.
If you are ordering anything engraved, allow two to three weeks and preview the text first: our guide to avoiding engraving mistakes covers the five errors that cause most returns, and what to engrave and where covers the words themselves.
See double-slot ring boxes Preview your engraving free
Not if the proposal box has two slots. A double-slot box holds one ring at the proposal and both bands at the ceremony. You only need a second box if you chose a single-slot design first, or if you deliberately want a slim hiding box and a separate display box.
Two — typically the engagement ring in one slot and a wedding band in the other, sitting side by side rather than stacked so both are visible when the lid opens.
A flat double-slot box hides far better than a traditional cube-shaped clamshell, because thickness rather than width is what creates a visible pocket bulge. If total concealment is critical, a slim single box is still the smallest option.
Yes, if the lid stays open on its own and the closure is magnetic rather than sprung. Look for a lid that holds its position, so a child is not fighting it during the ceremony.
The rings are visible before the box is opened, which gives the photographer the whole sequence rather than one frame, and it keeps the box on display afterwards instead of in a drawer.
Not always. Slot width matters as much as slot count — check the internal slot dimensions against the band width before ordering if the ring is unusually wide.