https://amazon.com/gp/product/B00BJ97LOO/ref=oh_aui_search_detailpage?ie=UTF8&psc=1

This one is 5' long and has a duckbill at the bottom for filling w/ regs.

https://amazon.com/gp/product/B000O9Y7DS/ref=oh_aui_search_detailpage?ie=UTF8&psc=1

This one is 7' long and also has a duckbill and you can fill it with a LPI too.

I have both but now I mostly use the 5' one. The 7' is annoying to make stand up while you're at depth. You need to be pretty negative to keep it standing.