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My 1L Kleen Kanteen SS bottle has a little opening in the top to allow airflow. The hole originally had a little rubber widget that I *think* was supposed to let air in. It didn't let in enough air for me drink quickly, however, so I took it out. Now I can drink as fast as I want, but if I tip the bottle over, water comes out of the opening.
My .75L Camelback SS non-insulated bottle does a much better job of balancing air flow with spill-resistance. I would carry it all the time and ditch the Kleen Kanteen, but 750 mL is not enough for me to commute home with on a hot day. Otherwise, the Camelback is by far my favorite bottle.
I have Topeak Modula cages for both of these bottles. They are just a hair too large for regular cages.
Both of my SS bottles have acquired a nice patina of wear-and-tear over time. The logos scratch up pretty easily, they've gotten dents from being dropped in the street, and both of them now wobble when set down because the bottoms have bowed out a bit. I think of them as the water-bottle equivalent to a well-worn Brooks saddle - they convey an impression of long, hard use. I don't want to think of how many plastic bottles I would have destroyed at this point!
Everything in moderation, including moderation.
2007 Rodriguez Adventure/B72
2009 Masi Soulville Mixte/B18
1997 Trek 820 Step-thru Xtracycle/B17