The diluent, properly specified
Sterile water preserved with 0.9% benzyl alcohol, so a vial can be entered more than once. Three formats. Australian stock, dispatched daily.

One reconstitution, zero waste. Break, draw, done.

The workhorse. Multi-dose, refrigerate, withdraw for weeks.

Five sealed ampoules, $5 saved. The bench supply.
Sterile water with 0.9% benzyl alcohol. The preservative inhibits bacterial growth between vial entries; that is what makes multi-dose use possible.
Batch documentation on request for every shipment. Labels describe research consumables, nothing else.