I have one on the back of the driver's seat and one on the front-facing passenger seat. I gave away the other two - in a 4-pack. Have you ever had to pull over and your large bag in the passenger seat flew forward, spilling its contents all over the floor? The hook I hold forward on the passenger seat prevents this by holding the straps in place. If I have a passenger, he doesn't even have to move the hook; it doesn't bother her. (I drive an Accord; this may depend on the design of the seat.)
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