Load capacity lower rear flap XC90

Yesterday after running: my one and two friends want to relax after running still comfortably with ́nem Fläschen barley juice and watch other joggers. To this of course the lower rear flap part really pushes itself – only: how loadable is the thing? I found neither a sticker, nor a hint in the manual. At the X5 (old model) is on the flap a sticker “125 KG”, I mean at the delivery of my car the something of “150 KG” murmured Does anyone know something more specific? Did I miss something in the manual? Greetings Frank – weighs as well as nothing (special greeting to Gseum), but the others…