While Crumpler's Dry Red No. 3 rolling carry-on wound up providing a surprising amount of space, now we turn to another bag you'd rightfully expect to provide generous cargo room: Their Spring Peeper with Wheels, a duffel bag perfectly sized to carry-on standards and featuring a retractable handle.
If we put the unladen bags side by side, they seem to occupy the same-sized footprint.
However, being a duffel bag the Spring Peeper doesn't have inherent structure on the sides, and this flexibility allows you to swell the bag up to its full 40-liter capacity (versus the 27 liters of the No. 3). The top and bottom panels are stiff and the retractable handle's frame provides stiffness on the bottom, which is what enables the bag to keep its shape.
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