This pack of 2 BPA-free Spectra Wide Neck Storage Bottles is compatible with your Spectra Wide Neck Breast Shield. These BPA free milk storage bottles make expressing and storage of your precious breast milk easy and convenient. Each bottle will attach straight to your Spectra wide neck breast shield, and hold 160mL of breast milk. These bottles make convenient, practical expressing without waste possible - express into the bottle, and store. Authentic replacement parts from the manufacturer. Compatible with all Spectra breast pumps: Spectra S1, Spectra S2, Spectra 9 Plus, Spectra M1. Discounts for higher quantities.