I will warn everyone here, watch what you buy and from who! The Baklfips ALL look alike and it would take a trained eye to spot the difference between them. If you buy direct from a reputable place or person (Morrie) it will come shipped direct to you in the OEM box, and that is the ONLY place they list the item type (HD or F1). So if you buy anywhere else, like Ebay or a great deal, if you don't get the OEM box, you have NO idea what you just got.... if you don't believe me, call BakFlip direct and ask them... I did! Buyer be warned!
Also, to the opening, each section fold onto the next, until you get to the last section. At the head of the coveris a small 6 inch or so part that the rest of the cover folds up on to, and that is what leans against the cab as the final part. Hope that makes sense, but there are videos on their web site that show all this as well.