<https://careexpress.com/product/flex-advantage-1000cc-disposable-liner-50-case/#product>
<http://schema.org/description>
"This disposable liner system requires a reusable outer Flex Advantage® canister. They have blue lids that are permanently attached to the flexible liner.  As an added safety feature, Flex Advantage® lids include a filter and a shut-off valve. Each flexible liner must be stretched out to fit into the long narrow reusable outer canister."
<https://careexpress.com/product/flex-advantage-1000cc-disposable-liner-50-case/>