>>256326Definitely, they're very similar along with Puras. Their capacity is the only way to differentiate them, really.
I myself went for Klean Kanteens as I got two for really cheap during sales, but otherwise I'd have been more tempted by 1lt Ecotankas.
Pic related: from left to right, Klean Kanteen, Pura Stainless and Ecotanka. I think that's how I arranged them, but I'm not even sure.