Instruction: Generate an answer to the question by utilizing the information contained in the document.

Input:
Question: How wide of a rail will the velcro straps wrap around?
Document: Had there been a description of how this fit on the bed headboard I would have known it wouldn't have worked on mine. There are three straps with Velcro on both sides and in the middle. The straps re 2 pieces with one at the top and one at the bottom. So it works great on the headboard pictured but not on mine. I have managed to hang it on one of the bed posts but it doesn't function that well.
I really like this storage caddy. I read the reviews of some other caddy's and they were not the kind that used velcro straps to attach to the headboard. They just were sandwiched under the mattress, and many people said that they would fall out. I can put in notebooks and my Bible in this caddy, as well as my cell phone, ipod, flashlight, etc. It could probably even hold my textbook!
I have an adjustable bed with a remote control and needed a place to put all my remote controls so I used the caddy on my side rail. Because of the Velcro it locks in place and once I took all the stuff off my nightstand it had some weight on it, but it held in place and everything is at my finger tips. The product is just as described by the manufactures.
This is very well made and holds everything I need it to. The velcro really holds it in place so you don't have to worry about it coming off.
I was looking for a bedside caddy that I could use in my dorm room, and this is perfect. I love that it's velcro and not one that tucks under the mattress (it's been my experience that those types fall out quite easily; they're very frustrating). I wish that the velcro were able to be tightened a bit more, but other than that I'm quite pleased with it.
I'm in college and on the top bunk. I got this so I would stop dropping stuff on my roommate. So I can have a water bottle, my tissues, my ipad, my phone all in one place and I can still use them before I go to bed and when I wake up without getting up :) I love this purchase because I put it not on the end of the bed but the guard rail for the bunk bed.
Works well enough. Only thing I dislike is that I have mine hung on the side of my kids' beds and they kind of slide down - no fault of the manufacturer though. I just would have bought one with smaller pockets or something if I'd anticipated this.
This product is flimsy and my daughter puts stuff in it and it falls out and off the loft bed to the floor. I would not buy this again.
This is exactly what my daughter in college needed. One little hic-up is that her Mac Book 13&#34; won't fit in it so she still has to climb down to put it away so the storage caddy didn't eliminate the need to climb down before she drifts off to sleep on the top bunk.
Other than that one feature, I would recommend this purchase to my friends. It is great for me as a college student, it probably would be a good gift.
Answer: The caddy is about 22'' wide and 10'' tall. It has three straps 2'' wide, which just come off the top edge of it. They're 13'' long with 8'' of velcro. The other half of the velcro is on the back of the caddy itself, so the straps wrap all the way around the sideboard and Velcro back onto the caddy.  See the third picture in the listing.