New series) How do I remove the sliding lid from the trainer cups?
The sliding lid is set to be a bit stiff. Be aware of the following points when removing it. As shown in the diagram below, press down on the straw cap while exerting horizontal force on the sliding lid in the “slide” direction. Pulling the sliding lid upward may cause damage or tearing. The straw cap may fly upward when the sliding lid is removed, due to the elasticity of the straw, so be sure to hold the straw cap down with one hand. If the sliding lid is stiff and difficult to remove, pick up either the left or right side slowly as shown in the diagram and remove it from one of the rails.
