How long does it keep drinks hot or cold?

The maker states 12 hours hot and 48 hours cold. That is at the top of what double-wall vacuum bottles this size claim, so expect real-world results to depend on how full it is and whether the lid is on.

What does the copper lining do?

The copper layer sits between the two stainless steel walls and adds a reflective barrier, which is how the bottle claims longer heat and cold retention than a plain double-wall design.

Can I buy just one bottle?

No. It is sold in lots of 25, so it is aimed at teams, events and gifting rather than individual buyers.

Can the bottles be printed with a logo?

Yes, custom imprinting is offered. Digitek and Digitek+ printing cannot be rushed, so allow extra time for those methods.

Is it dishwasher safe?

The listing does not state dishwasher safety. Hand washing is the safer choice for vacuum-insulated bottles with printed artwork.

How does it compare with a 17 oz Hydro Flask or Yeti?

It matches the size and double-wall vacuum build of those bottles and adds a copper lining. The main difference is that it comes only in bulk lots with custom printing, while those brands sell single bottles in stores.