I have used voltrx mixer bottle for at least 6 months, and the quality hasn’t deteriorated at all. My voltrx shaker bottle has only a few scratches because it was dropped during work and exercise, which can only prove the durability of this thing. There is a small gap in the bottle mouth. I think you would call it a cage. Even that thing is very strong. Materials and manufacturing are important. The only problem I noticed is that the voltrx shaker bottle is in the groove, the bottle head is screwed into the bottle body, and there is an O-ring to prevent leakage. This seal is particularly difficult to clean, leading to the growth of mold and bacteria, which is an obvious problem. I have tried using sponges, multi-tap nozzles, and dishwasher cleaning, but the effect is not good. Right now, I just use soap before some questions are prompted to reach the inside. If you use more water, clean the voltrx shaker bottle after each use. There is also a metal ball stirrer, which is provided with the voltrx shaker bottle. It can help shake any sediment left on the bottom of the voltrx shaker bottle. It is especially easy to clean because you can smooth it and scrub it with a sponge.