And you don't worry about nicking the anodising if you're carrying them around with you, as those linked ones aren't anodised anyway. I've seen them even less than that Amazon link on eBay, though.
The downside is they don't have an o-ring seal or even a spot for the o-ring to go, so they aren't air-tight.
autoteleologyWeird. I have one (from another source) that looks exactly like the one in the linked picture. It was thrown in as a freebie when I bought something else, I think.
The downside is they don't have an o-ring seal or even a spot for the o-ring to go, so they aren't air-tight.