How often should you replace a reusable water bottle?

Stainless steel bottles can last 5 10 years or more with proper care. Replace them if you notice dents that compromise the vacuum seal, persistent odors that cleaning cannot remove, or a damaged lid that no longer seals properly. Plastic bottles should be replaced every 1 2 years or sooner if you notice cracks, discoloration, or lingering smells these are signs the material is degrading.