I'm somewhat happy with the large inflatable version of this one https://www.aliexpress.com/item/1005002250378291.html I think someone else posted a review on this board some time ago, but I can't find it right now. The plug gains quite a bit of length when pumped up so it works well for pushing your depth boundaries. I like to use it in combination with my hollow Pig Hole FF plug. The biggest problem of this inflatable is that the small sealing plug that covers the air