|That's the model #150 on the left, and the #300 on the right.|
The numbers tell how much they hold in ml.
The bottles don't hold much liquid. The larger is listed at 30 cl (centiliters) or 300 ml -- which is only 10 oz. The smaller bottle holds half that much. That being the case, they wouldn't serve much purpose as regular water bottles, which is, I believe, where the "bonk bottle" name comes into play.
|An old catalog image. I've never|
actually seen one with that exact
logo on it, though.
Nowadays, lots of people use glucose supplements and the like for long rides. If it weren't for the fact that many of those boost products come pre-packaged in little disposable packets, I'd think that mini-flasks such as these should be quite popular. In fact, I've sometimes seen long-distance runners using "marathon belts" -- like utility belts that would hold a couple little flasks that are almost like a modern version of these bonk bottles. They'll mix up their GU (yeah, that's one of the brands) with some water and keep the little bottles in the utility belt. Doesn't quite have the vintage style factor going for it like these old TA flasks have, though.
|This little guy easily fits into a jersey pocket.|
I've never actually used the bottles, but I hang on to them for much the same reason that I hang on to things like old leather helmets. Just an interesting bit of vintage cycling ephemera -- a display item, or a conversation piece. Maybe one of these days, I'll get to take part in one of those Eroica rides on one of my vintage Mercians, wearing a classic wool jersey and leather helmet (hmm. . . maybe not the helmet), and one of these little flasks tucked in a jersey pocket. No amphetamines in my recipe, though.