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For the enlightened few who've discovered the joys of carrying less weight, the Mountainsmith Scream 25 Mountainlight Backpack is a versatile, durable addition to your quiver. Weighing in under a pound and fitting around 1500 cubic-inches of gear, the Scream 25 Backpack lets you transport your minimalist kit into the wild without adding unnecessary pounds to your shoulders or lifting excessive amounts of dough from your pocketbook. Use it on its own for dayhikes or add it to your expedition kit for a light-and-fast summit bid.

  • Stay-free back panel keeps weight to an absolute minimum; the trade-offs are that loads don't transfer as well to your hips and the max recommended load weight is capped at 20 pounds
  • Removable hip-belt lets you shave extra ounces when carrying lighter loads (lighter loads don't necessarily require assistance from a hip-belt)
  • Top-loading main compartment with single compression strap and top lid provides ample room for stuffing your lightweight gear
  • Side compression straps let you expand and compress your pack volume to match your load
  • Internal hydration bladder and port means you can pipe nourishing fluids directly to your mouth
  • Zipper front pocket adds organization and flips inside out to store the entire bag
  • Side mesh pockets house water bottles or on-trail necessities
  • Recommended max load: 20 pounds
  • Reviews
  • Q & A

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The King of Flash/Summit Packs

  • Familiarity:I've put it through the wringer

This is an an incredible collapsable daypack that has the functionality that other flash packs lack. I found the REI Flash Packs to be cramped and lacking in features, plus they are 2 ounces heavier. Astonishingly this 15 ounce pack has every feature I want and nothing I don’t. It has stood up to frequent overloading and abuse as a multi-pitch climbing pack, hiking daypack and even laptop bag. For quick deployment I tuck it in the outermost pocket of my bigger Osprey backpacking rigs and it is even suitable for ultra light overnight excursions. The pack does not have a frame sheet, but using a reservoir with a hard back like Osprey’s Hydraulics system provides a nice supportive and uniform back panel.
Pros: The super stretchy mesh side pockets are great for accommodating extra layers, food, sunscreen, beverages (swallows a sixer of tall boys with ease) or tripod without having to pry into the core of the pack. This material is remarkably resistant to abrasion/snags and greatly ups the capacity with little added weight and bulk. The brain of the pack is roomy enough to add more organization options and the front pocket swallows a couple small books/kindle or a few days worth of Clif Bars. When well packed the body has enough room to easily fit a mid-sized DSLR camera (sheathed in its own case with accessories), rain jacket and 3 liter water reservoir . On the outside of the pack there are a couple light duty loops for trekking poles/ice axes which provide additional loading options. I have packed upwards of 14kg (50% more than its rated for) in this pack and predictably it wasn’t comfy (can be remedied by threading a thick pair of old tube socks onto the straps) but it carried well.
Minor Gripes: No sternum strap. The interior of the yellow ripstop fabric is peeling like a molting lizard. This doesn’t seem to have affected longevity, but it puts me at risk of littering a trail of little rubbery strands anywhere I use the pack (super bizarre defect that I have never seen on any ripstop before). Also, the seam on the right strap looks a little strained with a little of the trim fuzzing up (same issue with MountainSmith detachable day pack from Cross Country 3.0 70L). After 2.5 years of heavy use it looks like the stitching where the bottom of the strap attaches to the pack is going to blow soon (could probably be reinforced with ease if I knew my way around a sewing machine). Despite these minor shortcomings I am still stoked on this pack. I was pretty impressed when I carelessly slammed the waistbelt buckle in the car door (multiple times) and it still functions perfectly even though half of it is fractured.

Bottom Line: For 30 months I have routinely overloaded and abused this pack. I am very happy with the tradeoff between weight, function and durability. They come in at a higher price point that a lot of competitors, but it is totally worth it! I will be ordering another 2 just in case they quit making them. Bravo Mountainsmith!

Follow my adventures into the mountains, down the canyons and around the globe @Frazier_Far_Out

waist strap buckle broke first day

  • Familiarity:I've put it through the wringer

The buckle broke first day! musta went too hard...Great minimal day pack, packs into itself! got it at Outdoor retailer for charity benefit and i recommend it for sure!

Hey Ryan...this is Jay Getzel, the president over at Mountainsmith, we're psyched to hear you like the Scream 25 but want to make sure we got you set up with a new side release for your waistbelt. You can call our customer service folks at 800-551-5889 and we'll get a new buckle out ASAP.

Mountainsmith Scream 25

Our lightweight and compressible Scream 25 sets the precedent as the perfect secondary pack to escort you into the backcountry or next overseas trip. With the reversible front panel pocket, the Scream 25 can be stuffed inside and stored in compact form for travel, packing, storage, etc. Coming in at under 1lb, this durable daypack is made from high tenacity nylon ensuring years of use on and off the trail. Dual trekking pole mounts, breathable shoulder straps and bottle compatible side pockets provide a perfect secondary ruck to escape from basecamp and explore those peaks in comfort!

Multi threat

  • Familiarity:I've put it through the wringer

This bag works great! Packs into self, large side pockets have held water bottles, gloves, hats and even a micro fleece once when it got hot!! I have used it on plane, streets, rivers, and of course hiking.

Does thsi bag fold in on itself? I see...

Does thsi bag fold in on itself? I see that other similar bags do, but I can't find anything about this one.

Best Answer

Yeah, it folds into one of it's pockets. It's very compact when stuffed in the pocket. I recently used one as a day pack on a river trip. It's great because it doesn't take up any space when you aren't using it, but when you need a decent sized day pack it's perfect. Super comfy and even though it's really lightweight it seems to be super durable.

Yeah, it folds into one of it's pockets. It's very compact when stuffed in the pocket. I recently used one as a day pack on a river trip. It's great because it doesn't take up any space when you aren't using it, but when you need a decent sized day pack it's perfect. Super comfy and even though it's really lightweight it seems to be super durable.