Yes, they fit many others. In fact we have tested the bottles listed below ↓  and have achieved proper fitment.   Hydro Flask Wide Mouth 32oz (Old and New 2.0 style) Hydro Flask Wide Mouth 40oz (Old and New 2.0 style) Hydro Flask Wide Mouth 64oz (Old and New 2.0 style) For more bottle fitment information also see →BUMPER TECH