I know you are looking for these bags, but have you considered others? MSR makes their Dromedary bags, and are very tough, and can accept from freezing to boiling water, and a MSR filter pump will screw right into the fill line. Just a thought. Also, if you are interested, I bought some Gerber Breast milk bags for my PSK, and like them. They are sterile until opened, and tough. There are like 20 in the box, and I will send you a couple if you like. Just send me an envelope with return postage. e-mail me if you are interested.
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If only closed minds came with closed mouths.