The North Face Youth Terra 55

This is a great 3-5 day backpack for kids, especially Boy Scouts. Has the necessary amount of storage for a kid's pack.

This is a great backpack for Boy Scouts because of the size and fit range. It is priced reasonably($139) I got mine for $99 dollars at sunnysports.com on sale because it was the 2011 version. Note: The only thing that changed from 2011 to 2012 was the color.

But anyway, the capacity is great, it compresses well to fit smaller loads with one problem, the top flap/pocket hangs slightly loose. But the pack is built very solidly and can handle loads well.

The Opti-fit system is a blessing, it will fit your small Boy Scout, but will grow with them as they progress in ranks.  The only problem is... the numbers are completely off. I have a 15.75 inch torso but I have to adjust it much larger (17.5) in order to make it fit.  

I have used this backpack on several short trips and also on several longer car camping trips. The volume is great but some people consider it small, but the smaller size keeps the weight down and prevents unneeded items from being brought on a trip.