In anticipation of a bout of long, hot, cycling, I cleverly popped two of my stainless steel water bottles into the freezer the night before.
Naturally, I filled them only part way — about three-quarters full. They were frosty-wonderful when I popped them into Basil’s new bottle cages.
Imagine my surprise, then, when I stopped to swap bottles, and discovered only a chunk of ice at the bottom of one bottle.
The frozen water had stressed the stainless bottle beyond endurance, causing an explosion. This was painful to see. Also, this result rendered my “frozen bottle” approach considerably less clever than I had originally thought.
Had I filled a plastic container with apricot preserves, and left only a half inch at the top, all would have been well. Obviously, my calculations for actual ice were off; Mr. Diarist suggests, additionally, that the narrowing of the Sigg bottle toward the top may have played a part, depending on how the freezing actually progressed.
The second bottle escaped with stress marks (stretch marks?) along the side. Also, the bottom is now slightly convex, which causes it to rock a bit when set on a flat surface.
In future, I’ll fill the replacement bottle, and the other two, only half way up the lower portion of the bottle. Just before leaving, I’ll add cold water to top up. This won’t keep my libations as refreshing as would solid ice melting, but will keep down the water bottle replacement expenses.