Problems with keeping the cap on [SEP] These bottles are made of a nice weight glass and I love the size for mixing up my essential oil mixtures.  But I tried using it for making a spray conditioner for my dog and I had trouble keeping the screw cap on while using it.  I got some of the mixture on my hand and had a hard time keeping my grip on it.  But it worked fine with the other combinations I used.<br /><br />The labels are nice to have.