Think of this as a go-to pack for all the items you need to quickly access like cell phone, food, keys, basic tools, etc. The Cedaero Tank Top Bag has two Velcro & ToughTek cinch straps and a moveable Velcro OneWrap cinch on the stem to keep it from flopping like a fish. The burly water resistant #9 coil zipper enables easy single-handed opening without sticking. Internal foam padding provides some cushion and gives structure to the pack. The interior is equipped with a flat mesh pocket and a key hook. The bolt-on Tank Top works only on bikes equipped with top tube bosses.