Need new hamper for old Lambert lawn sweeper

[David in Michigan]

I inherited a Lambert lawn sweeper, but the hamper (bag) is completely shot. The sweeper is a Lambert “Apollo”, 31- inch width, model ST-411. I would be overjoyed to find a compatible hamper. Barring that, I would welcome any advice on making a new one: material, fabrication techniques, pattern, etc.

Thanks.

David in Michigan