The cap does not hold and is not protected against polarity reversal. If it is put on the wrong way round, it holds firmly because it is glued on. If, on the other hand, it is fitted correctly, it clamps too tightly and falls off by itself. In addition, the two pistons can fall out of the container and are also not protected against polarity reversal (there is no stopper when pulling them out). This means that the risk of mess when storing the tube is too great for me and unfortunately it ended up in the garbage can after one use. Note: my packaging was gray instead of yellow, but the name of the product and the appearance were the same.