AUWA Earth in Australia seems to have the best or at least one of the best feed tube designs that I’ve seen. I really enjoy browsing sites like AUWA Earth that obviously are ‘dialed in’ – who really know what they’re doing and who are turning out quality projects. I’ve never met them or have any financial relationship with them — just promoting good workmanship when I see it. We’ll probably replicate their feed tube design for the earthbag school project in Nepal. We need to make numerous simple, low cost, easy to fabricate feed tubes to keep four crews busy. I particularly like the funnel shaped top that facilitates filling the tubes.