Feldherr had new double-size foam tray sets over at Spiel this past weekend and now they’re up on their website.
From the website:
The transporter is a large-volume, lightweight bag – the easiest way to transport our storage boxes M or XXL.
One bag fits 4 storage boxes size M or one box size XXL.
Only the Feldherr transporter fits one storage box XXL to carry up out double-size foam trays.