OP= looked into fabbing up bags instead of buying- was going to cost more than the bags, by the time I had somebody do the sewing...

Sewing silk screen so that it won't tear is a bitch- 5 g of water is heavy...

We should chat off-board, but I can't rep you w/ an e-mail addy until I " spread some reputation around" - I have further input, on the dl.