The Slappa BulkHead PRO 4 in 1 takes "modular" to a whole new level. My inner efficiency expert got kind of thrilled at this concept.

It's a smart idea for travelers who might want to use all the extra compartments to pack their stuff but could use a slimmer bag at their destination.

At left is the bag all zipped together; at right, it's unzipped into four separate padded bags, each of which can be used alone. If the zippers were hard to work, that'd be a dealbreaker, but zipping and unzipping is easy; you could add or remove modules on a crowded plane, or wherever you needed to, pretty quickly.

The bag's made of "rainproof BuckBlast suede," which is nice-looking and feels pretty like tough material. This version is $179.99 direct. Other versions are available for less (see the company's comment below).

Cheap geeks, take note! Slappa is offering a 10 percent discount on this bag to Gearlog readers. Just enter the word "gearlog" as the discount code when you're checking out.