I have two of these to sell. The "Cache" is a protective laptop or tablet sleeve that's available in many sizes. It's designed to protect your device against scrapes and scratches. The Cache protects your laptop or tablet and is ideal for those who don't want their device case to make their loads heavier or to take up a lot of space. It cradles your device in .25" / 6 mm thick foam padding laminated with an exterior of heavy-duty polyester knit and an interior of brushed tricot. The Cache features a #5 YKK coil zipper with two plastic sliders: important because the plastic won’t scratch your device. On both sides of the Cache are two parallel "rails" of 1" wide, lightweight nylon webbing which extend from the top to the bottom. Included with the Cache are two removable Gatekeeper Rail Clips. To attach the Cache to one of our larger bags with the compatible rail loops simply unclip the side of the Gatekeeper Rail Clip that isn't clipped to the Cache, slip it through the webbing rail loops in the larger bag's main compartment, and flip it shut. Slip the Cache inside the larger bag, and pull it back out: you'll see that the Gatekeeper Rail Clips ride the rails of the Cache, allowing you to remove your laptop from the larger bag entirely while it is still encased in the protective Cache.