That's probably it. The number in the triangle indicates how often you should reuse the container. Lots of high dollar water jugs have really lousy numbers. Which it probably the reason that Nalgene has dropped their line of polycarb bottles, they had a bad number. Bad number equals more of the methalethalbadstuff you get if you use them too much...
Not true. The number is a Resin Identification Code...basically what type of plastic it is so that recycling centers know how to sort it. Different polymers need to be recycled in different ways.
http://en.wikipedia.org/wiki/Resin_identification_codeIronically the infamous '7' is the 'other' category and contains many plastics which don't contain the controversial Bisphenol A...which has yet to be proven as harmful.
Changing the subject slightly back on course these look almost exactly like the Source liquitainers I like only the Source ones have a bottle top like a bottle of water instead of a zipper.
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