Renting kit in the right size, at the moment the place is booked

How do I put rental kit on the booking?

As an add-on with a variant per size. The variant is the sellable unit, which is also how per-size stock works: eight large wetsuits is eight, five mediums is five, and each is counted separately as bookings come in. The checkout renders one input per size, capped at what is left.

The whole basket is one transaction. Place plus wetsuit plus fins is a single payment, a single fee calculated over the whole basket, and one balanced set of ledger entries. Rental kit mints no place and no credential of its own — it is an item on a booking, not a second booking.

What happens when the last large wetsuit goes?

The next diver sees it is gone, at the point where they can still do something about it. Add-on stock is not held while somebody fills in the form — it moves when the booking confirms, under a row lock on the variant — so two divers racing for the last large is resolved cleanly: one gets it, and the other is told before any money is captured.

That design choice has a trade-off worth knowing. A diver who loads the form while a large is free and pays ten minutes later can be refused, and the capture is unwound rather than charged. Holding stock for the length of a form instead would mean gear sitting reserved for people who never finish, which on a busy Saturday is worse.

Should sizing be an add-on or just a question?

It depends on whether you are counting anything. This vertical already asks every diver for wetsuit and boot size as a question, which is the right tool when you have plenty of kit and just want the crew to have it laid out. Nothing is counted, nothing can sell out, and it does not appear on the bill.

Make it an add-on when the kit is genuinely limited or when you charge for it. An add-on has stock, has a price, appears on the order and can be refused. The question and the add-on can coexist: the size question tells the instructor what to hand over, and the add-on is what the diver paid for.

What does bindro not track about my kit?

Everything after the booking. bindro counts how many of a variant were sold for a given course; it does not know which cylinder went to which diver, when a regulator was last serviced, when a BCD is due for inspection, or whether the kit came back. There is no rental asset register and no service history, and building one is not on this vertical’s path.

That is the honest boundary between us and a dive shop management system. If servicing records and asset tracking are the problem you are trying to solve, the comparison pages on this site say plainly that a shop system does it and we do not. What bindro does is stop you selling a large wetsuit you do not have.