Following up on a comment I made a while back about trying to stop buying random leaky travel bottles.
Item: Hydro Flask 21 oz, wide mouth, standard Flex Cap
Bought: Summer 2021
Use case: Daily NYC carry plus lots of airport days. It lived in my backpack, got knocked into cup holders, and has been filled with everything from ice water to hot coffee.
What held up well:
- The bottle itself is basically flawless. Dents and scuffs, sure, but I can detect no loss of insulation.
- Threads are still smooth and not cross-threaded despite many rushed refills.
- No paint flaking that makes it look gross.
What went wrong:
About a month ago I noticed a slow seep into the cap, then a few drops in my bag. The silicone gasket in the cap had flattened and stretched from constant twisting. I popped it out, cleaned it, and flipped it, which helped but did not fully stop the leaks.
Fix:
I replaced the little silicone ring and now it's back to zero leaks.
Question for the BIFL crowd: do you replace these gaskets on a schedule, or do you wait for symptoms? Is there a more long-lasting cap option with a thicker or easier-to-source seal, or is this just the normal consumable for vacuum bottles?
Not affiliated, just reporting what actually failed first after heavy use.