The bag is a flat pouch. Two faces are welded together around the edge: a clear, impervious multilayer LLDPE film and a white, breathable Tyvek® flash-spun HDPE microbial barrier. The barrier face is tested to ASTM F1608, acceptance criterion LRV ≥ 4.
The rigid round beta flange, Ø 190 ± 0.4 mm in high-temperature polycarbonate, is sandwiched into the face of the pouch at its lower-middle, with pouch material above, below and to both sides of it. Its flat cover, also polycarbonate, faces outward. The beta seal is platinum-cured LIM silicone, the O-ring platinum-cured silicone and the weld ring HDPE; all three are product-contact parts. A removable stainless-steel pull handle is optional and never touches the product. That is all eight parts; every contact material is listed in the anatomy chapter below.
Held by the flange, the pouch hangs flat in front of the operator. At the port, the flange engages the alpha port, a short turn locks it, and the alpha door and the beta cover become one plate that swings inward. Contents pass through; the door closes; the bag turns back and comes away with its cover sealed again. The bag is supplied in a double-bag configuration, overwrapped and tamper-evident sealed; the carton carries the lot, the configuration, the dates and a QR-coded GTIN.