I'm not sure I would use the word "durable" vs maybe declaring capable; one has to take care, they can rupture easy if stretched greatly. I was wondering if they could actually lift it out of the sink without rupture and clearly they did. Lacey Wildd told the story how she ruptured her implant over-filled to 6100cc; when you have a top loader washer, big implants make reaching in to remove clothes difficult; with her right boob on the top edge, she reached and the pressure caused it to pop. Foxy, Luna, & Brandi were talking about the things their implants made them do differently or they just cannot do anymore and top loading washers came up. Luna 4k said she tried to make her boobs straddle the edge, Brandi 5k said she had to get a front loader, and Foxy 10k only offered that her boobs won't separate like Luna, but didn't say she actually did wash.
But it would really be something if there was some lighter filler that permitted a girl to walk about with 50k implants. Rather than weight 110lbs each, if they could get the weight down to maybe 45lbs, if could be done; ask Beshine. 50k would be like a 18" sphere, so laying against the ribs, the shape out be more like that implant laying on the table. So many things would suddenly become a challenge, like doorways.