Can I travel with the Flex Foaming Cup Wash? The Flex Company April 08, 2021 21:09 Updated Follow This wash is as ready for vacay as you are. We’ve packed 3.4 ounces (100mL) of Foaming Cup Wash into each bottle so it can sail through TSA. Related articles Can I use Flex Foaming Cup Wash on my body? How do I use the Flex Foaming Cup Wash to clean my Flex Cup? Can I use Flex Foaming Wash on other silicone menstrual cups? Why do I need a specific wash for my menstrual cup? Messy Removal Comments 0 comments Article is closed for comments.