Huge 500ml bottle (not pretty, not a spray). Described as a refill.
Great value¸ works out at less than £6 per 100ml. RRP of 100ml EDT spray is around £58, but. generally available online for £15 to £16 (Direct Cosmetics is my usual port of call for this, working out somewhat cheaper - OOS at present though).
I have used Direct Cosmetics many times (always excellent). Some products are testers/unboxed (always clearly stated). They do sell a refillable small spray (£0.55 +P&P) useful for my giant bottle of EDT.
Hope this is useful to any other Madame Rochas lovers!