Self-sealing lid provides leak-free seal; Large, easy to read graduations; Integrated Aerostat® filter with >99.99% bacterial efficiency; Mechanical shutoff valve prevents overflow and contamination; Frosted panel provides writing area when needed; Includes two elbow adapters per canister for optional use on Patient and Vacuum ports; Accessory port accomodates Specimen Collection Adapter; Port Caps attached for quick and secure capping; Nestable for storage; Disposable, single use; Latex, BPA, and DEHP free.