Hi Valerie,
Thanks so much for reaching out!
If a bottle has been dropped or placed in the dishwasher, it can compromise the vacuum insulation — which is what keeps your drinks cold for 24+ hours. This is often why older bottles may not keep temperature as effectively over time.
That said, it’s also completely normal for ice to melt in insulated bottles over time — even ones that are functioning perfectly. Our bottles use double-wall vacuum insulation to prevent heat transfer, which keeps the liquid ice cold, but doesn’t stop the ice itself from slowly melting. The key is that even after the ice is gone, the water stays refreshingly cold for hours — that’s the insulation doing its job!
We recommend always hand-washing your bottle and avoiding heavy impact to keep it performing at its best.
Please don’t hesitate to reach out with any other questions — we're always happy to help!
Warmly, MBB Customer Service
