“Love mine so much - there’s only two flaws that I’ve noticed over time: 1) hot weather can cause the lid to warp and get stuck on/ deformed .. 2) it’s really difficult to remove the internal sipper lid portion when it gets gunky in order to clean it out. Both of these experiences unfortunately caused damage to the water tightness of the lid and now it leaks :( but I will be buying a new lid and would recommend a backup lid as well”