Currently using a Mithril, but just mailed it back to Moonbow to have it augmented...Moonbow Gear (Jonathan and Rhia) are awesome for customer support/demand/wishes...if you can dream it they can make it! Have probably 15-18 packs in the collection but love the Mithril, it replaced my GVP-4 because it is almost as light but the Spectra gives it the strength I wanted in an ultralight.....this pack is true to the advertisements-you will forget you have it on.