I like the Flash 45 fine, though I made a few modifications. I was surprised at the poor review by outdoorgearlab, given that the pack works reasonably well, is comfortable, and is a great bargain. I like how the bottoms of the frame/stay attach directly to the hip belt, and the hip belt is relatively stiff – good load transfer for 25 lb loads or less.
Compared to another popular big-name pack, the Osprey Exos, this pack carries MUCH better IMHO. The Exos holds the weight far away from your back and has a more flimsy hip belt that didn’t transfer weight well from the frame/stay. While the Exos handled 30 lbs a little better than the Flash, I preferred the way the Flash carried and distributed weight to the hip belt.
After modifications, my Flash 45 weighs 30 ounces. Here’s what I did:
- I removed most of the webbing and buckles on the front and sides and replaced with light chord instead. Also cut out the double layer of fabric on the inside of the top pocket and cut out the hydration sleeve.
- I sewed the top attachment points for the front pocket (three of them) to the main pack to prevent the entire pocket from dumping everything when the top is un-clipped. Very important modification IMHO.
- The side compression system could work better, especially toward the bottom of the pack. However, there are lots of convenient loops and attachment points all over the pack that can be easily used to pull in the volume with a little ingenuity and chord.
- The sternum strap does not stay put and rides up on both sides. Easy fix with thin bit of chord to hold it in place in the lowest position.
- The hip belt buckle slowly loosens during the day. Not a big deal as I usually adjust the belt and shoulders every hour or so anyway to re-distribute load differently throughout the day.
- The hip belt does not contour around the tops of the hips. Not a big deal, but it can be compensated for partially by keeping a strong angle between the webbing and the buckle. A V-style 4-pull hipbelt (like the 2015 Arc Blast) would be better obviously.
- The load lifters don’t do much, but they are at least near the top of the frame (which is good). I was able to snug them up slightly and they did help a little to pull the pack top toward the back.
- As with most light packs like this, the comfort is largely dependent on how you choose to pack the contents in the main compartment, especially against your back. A bit of trial and error got it dialed in, and the pack carried comfortably, snugly and uniformly contoured to the shape of my back.