This is the soft cover I got from Access. Like most covers, it has sliding type locks underneath on each side at the end where it meets the tail gate. The cover stays locked in placed with or without the gate down.When you want to open it, it folds up really neat to the back of the tool box and held there in place by straps. I didn't want to get a cheap cover and this one was recommended to accommodate the shorter length of the box due to the tool box.It had to be ordered as they didn't stock the shorter version. As for gas saving,it may cut down on some wind drag on the highway and may save you a few cents but I can't confirm that as I haven't done any tests with the box covered and uncovered.