Purchased for day hikes.

Good The design is cool, the side zipper is a nice feature, and the outer pocket is made of durable fabric that holds a lot of gear. Bad The base is narrow, so it won't even fit a laptop (limiting use to hiking trips); the top closure is a hassle (I replaced it with a quick-release strap); and the chest pockets don't hold as much as expected.

Very Disappointing Fit – $600 Wasted

I carefully measured my chest and followed Hyperlite's sizing chart before ordering the Pemi 15 in Large. Unfortunately, it was far too tight. Thinking I had simply chosen the wrong size, I went ahead and ordered another one in X-Large, paying for the pack and international shipping all over again. To my disbelief, the X-Large feels almost exactly the same. Both packs are uncomfortably tight around my chest, especially when breathing deeply, and neither leaves enough room for an additional fleece layer. Returning them internationally is prohibitively expensive, so I'm now stuck with two expensive packs that I cannot comfortably use. I've spent close to $600 on what has turned out to be a very disappointing experience. I expected much better from a premium brand like Hyperlite Mountain Gear. A huge letdown and, unfortunately, a complete waste of money.

Great pack funky sizing

I bought this pack for long winter trail runs where I want to pack layers and I’ve also been looking for the perfect summit pack. The Pemi 15 seemed to check all these boxes. I’m using this in addition to my Salomon trail running vest which doesn’t hold any extra gear. That vest is a size Large for a 41-43” chest. I’m 6’ tall and 200 lbs. I measured my chest while inhaling and I’m a 43” chest so I bought an XL. When I first got the pack I was pretty disappointed because it just felt a little too small even when fully extended. I started thinking that this is a skinny persons sport and that I’d be relegated to just the Salomon. I just went on a shake down run and it seemed to settle in. I just can’t let my chest get bigger.