Mine are a combo of GoToobs and Stax (both by the brand Human Gear) for things like shampoo/cleansers and Nalgene containers for things like mouthwash that need a tight screw top lid. Love them! Dishwasher safe and BIFL.

In fact, I lost a few caps to my GoToobs and emailed Human Gear to ask how I could buy more, and they sent me a bunch for free saying that it is part of their lifetime guarantee.

The design of the Stax is nicely space-saving.