For BMW System Cases with optional, extra-spacious Deep Lids. (See pg.10 in the Bob's Catalog to learn more about this great way to increase your touring capacity.) These liners have the same features as standard R-type liners above, but with an additional expansion gusset in the center. When the gusset is zipped shut (as in the bag on the right), use the liners with the standard size System Cases. But when you've installed the Deep Lids—to get more room for a long tour, for instance, simply unzip and open the gusset (the left bag in the picture). Now, in seconds, these clever bags have gained about three inches in girth for a perfect fit inside the huge cases. Swap back and forth between standard or deep lids as you like, and Kathy's new Expandable Liners are ready for the trip either way!