Based on this product's specifications, here are some alternatives and similar models
Envelope folder LEITZ Recycle Document Wallet A4 Polypropylene 235×313×7 mm Blue Angel
Summary description:
LEITZ Recycle Document Wallet is an A4 envelope folder made of polypropylene (PP) with dimensions 235 × 313 × 7 mm. Single-piece pack designed to store and protect loose A4 documents; acid-free material preserves paper. Certified with Blue Angel for sustainability. Suitable for filing, document transport and short-term archival storage.