These Polar bottles will fit in just about any cage out there. They're insulated - I've had other insulated bottles, but they've all "sweated" and leave ugly (to me) condensation drops on the frame; these DO NOT sweat, even in 90F+ temps here in Ft. Worth, TX. Insulation must be better, because they retain ice longer than other bottles. Available in many colorways, if that matters to you. Also made in USA! The pull-to-open valve can be a tad difficult to open, but that also means no inadvertent leakage, so that's a plus. Best bottle I've owned - bought one at Hotter 'n Hell 100 this August in Wichita Falls, TX, liked it so much got my 2nd one from WBW. Great bottles, highly recommended!
Bottle insulates well, is relatively easy to clean, and nipple doesn't get gunk or mold build-up like some other brands. Also like the color and subtle graphics a well. I had high expectations for this bottle given it is pricier that some other big name brands, and it delivers
I use 1 liter bottles - the extra weight makes bottle ejecting more likely. No bottles lost since installing (a few hundred miles of use)
I use 1 liter water bottles and the extra weight makes them more likely to be jettisoned over rough terrain - my bottles have been secure
I never realized until now that I've been searching for these cages for at least the past 10 years. They work perfectly for any size bottle and the adjustments clicks are very fine. You can cinch each bottle down with just enough resistance that it can come out easily, or a little stiff, or if it's the secondary that you're not using yet, super tight. My favored bottle is a Thermos stainless double wall insulated (24 oz?) - because I absolutely hate drinking hot water. I could make other cages work, but always with rattles - and sometimes a bottle launch at a big pot hole. These are perfect. Perfect fit. Perfect access. No rattles.