I have it narrowed down to these 3 packs: 1. Brenthaven 15/17 - http://www.brenthaven.com/store/flash/flash.html 2. Tumi T-Tech Bethune Laptop Backpack - http://www.tumi.com/backpacks_messe...kpack/product_detail/index.cfm?modelid=12942# 3. Tumi T-Tech Chambers Deluxe Computer Backpack - http://www.tumi.com/backpacks_messe...ckpack/product_detail/index.cfm?modelid=12927 I want something that can take a drop or fall and protect a 15" powerbook sufficiently. These 3 all have a sling like sleeve that holds the laptop and apparantely absorbs the shock. Thanks!