Keystone West via Amazon offers the Case Logic Kilowatt Medium Sling Backpack for Pro DSLR, model no. KSB-101, for $109.99. Coupon code "MHKG44US" cuts it to $64.99. With free shipping, that's the lowest total price we've seen and $40 under the best price we could find for a similar Case Logic backpack. It protects DSLR with up to a 5.5" lens and can store four additional lenses, flash, or other accessories.