Safely holds documents when you're on the go. Repositionable elastic straps secure materials in place during transport then fold down over gusset for drawer storage to prevent pocket sides from catching on rails. Redrope gusset with rollover Tyvek? reinforcement is virtually tear-proof. File expands as necessary to accommodate bulky records. Expandable File Folder Type: File Pocket; Size: Letter; Width: N/A; Height: N/A.