While they aren't hard-sided, I've been using Platypus bottles (http://cascadedesigns.com/platypus/b...bottle/product) for years and really liked them. They come in 500ml, 1 liter, 2-liter (and larger I think) and allow you to get all air out. Since they are soft-sided, they do need to be stored in a container that will support them or laid on their sides. The bottles I've stored D-76 in have slowly (over years) turned brown, but I'm not sure if this is staining from used chemistry or oxidization through the plastic.