I know this is a bit late, but scoutstuff.org has a good selection of youth packs. I particularly like the Scout Hiking pack. I use it as a daypack, and it fits my 10 yo son and 8 yo daughter pretty well.
Our long-time Sponsor, BackcountryGear.com - The leading source for ultralite/lightweight outdoor gear:
Affiliate Disclaimer: This forum is an affiliate of BackcountryGear.com, Amazon.com, R.E.I. and others. The product links herein are linked to their sites. If you follow these links to make a purchase, we may get a small commission. This is our only source of support for these forums. Thanks.!