The Mountainsmith Scream 55 Backpack is a multi-day backpack that’s well-featured, quite durably built, and relatively inexpensive. It’s undergone some design changes this year, including a sturdier frame and a new U-shaped front panel opening that will appeal to overnight and weekend backpackers, as well as travelers. It’s also over a half-pound heavier than the previous model, weighing just a hair under 3 pounds, with a max recommended load of 35-40 lbs. While these new features will increase the audience for the pack, they move away from its original minimalist premise, when it was simpler and lighter weight.
Specs at a Glance
- Weight: 2 lbs 13 oz (2 lbs 15.6 oz, actual tested) (the previous model weighed 2 lbs 4 oz)
- Volume: 55L
- Type: Internal frame (1 center frame stay)
- Materials: 210d Robic High Tenacity Nylon with (Aramid) R/S, 210d Nylon Embossed Liner
- Gender: Male (a female version is available called the Scream 50 WSD)
- Waistbelt: 28″ – 48″
- Torso fit range: 17″ – 21″
- Bear Canister compatibility: Vertical
- Max Recommended Load: 35-40 pounds (the mfg puts it at 45 lbs, but I think that’s high)
Backpack Organization and Storage
The Mountainsmith Scream 55 has a huge main compartment, two “double-barrel” pockets on the front of the pack, and large side water bottle pockets. There are no interior pockets except a hydration reservoir sleeve and central hang loop.
The main compartment is accessed from the top of the pack, which has a roll-top closure, making it easy and fast to pack and unpack. The advantage of a roll-top pack over one with a top lid is that it’s easy to roll up the unused capacity and compress your load from the top. Once rolled up, the top webbing connects to buckles just above the side pockets, so they don’t interfere with pulling out or replacing water bottles them (a nice detail). You can also clip the two ends of the roll-top together on top, but this leaves two dangling straps and buckles.
A U-style zipper has been added to provide panel style access to the main compartment so you don’t have empty the pack to find gear buried deep inside. It’s redundant with the roll-top, so you have to wonder why Mountainsmith didn’t just drop the roll-top, and make a pure panel loader instead to save weight and reduce the pack’s complexity.
Moving to the front of the pack, the Scream 55 has two long cylindrical pockets that close with side zippers, which Mountainsmith calls “double-barrel” pockets. They’re perfectly sized to store a cooking pot, fuel bottles, a tarp, or layers that you want easy access to during the day without having to open up the main pack. Both pockets close with side zippers, but you need to be careful not to catch them on the fabric of delicate wind shirts or rain jackets if you stuff them here. The pockets don’t have drain holes though, so I wouldn’t recommend putting very wet gear into them. If you use a water filter, you’re going to have to figure out where to put that wet dripping thing, so it doesn’t soak your pants.
The pack also sports two long side mesh water bottle pockets capable of securely holding 32-ounce water bottles. The bottom of the mesh pockets is covered with solid fabric for better durability since mesh pockets frequently get ripped here when they come in contact with the ground or vegetation along the side of the trail. However, the mesh pockets are quite tall and it’s very difficult to reach back and pull out or replace a water bottle stored there. The bottom tier of side compression straps can be run over the side mesh pockets or through them, if desired, so you can carry a bottle in them and use the compression strap at the same time.
External Attachment Points and Compression System
The Scream 55 has two tiers of side compression straps that can be used to reduce the volume of the pack and stabilize your load. If needed, you can also run webbing or cordage through the rear attachment points of the compression straps (which are open) to attach gear to the back of the pack using cord locks and accessory cord. While it’d be a little awkward to attach gear over the rear cylindrical pockets, it is doable.
In addition, there are four gear attachment loops on the seams along the front and back of the pack, and another four at the bottom of the pack, making 12 total. You’d need extra webbing or elastic cord, but you can attach all kinds of gear to the outside of the pack this way from tent bodies and sleeping pads to skis and snowshoes. In fact, the Scream 55 could make a good winter ski pack with its closed double barrel pockets and some webbing to lash gear to the outside of the pack.
There’s also a single daisy chain running between the two rear pockets with an ice axe loop at the bottom and an elastic shaft holder at the top that could also be used to carry trekking poles. Kudos for including a shaft holder. A lot of backpack manufacturers leave it off.
Backpack Frame and Suspension
The original version of the Mountainsmith Scream 55 had a thin foam pad for a frame but has been augmented with a center aluminum stay to increase the maximum weight that the pack can carry. The pad and the stay are both stored in a compartment located behind the hydration reservoir pocket. While you can open this compartment and pull out the stay rather easily to bend it and personalize the fit, the foam pad is very difficult to remove because it’s packed away so tightly. If you do manage to get it out, you’ll never get it back in again. Since it holds the stay in position, you should just leave it alone.
One of my favorite parts of the Scream 55 is the hip belt. Mountainsmith’s pack hip belts are always very well-engineered and the Scream’s hip belt is pretty exceptional. While padded, the hip belt does not have too much padding, ensuring a good wrap around your hip bones. The rear of the hip belt has a mesh-covered lumbar pad for extra grip, but it’s rather assertive out of the box. You can relieve that pressure by removing the aluminum stay and bending it over your knee if your back needs more space. (See how to bend frame stays)
Wide, pre-curved hip belt wings are sewn to the back of the pack for added stability and have oversized hip belt pockets made so you can conveniently carry a lot of gear close at hand. Rear hip belt stabilizers behind the hip belt pockets let you pull the base of the pack closer to your hips, improving load transfer and weight control, while a pull-forward cinch makes it easy to adjust hip belt tightness.
The shoulder pads have the same breathable mesh as the hip belt, hydration hose keeper loops, and an adjustable sternum strap. The Scream comes with load lifters, but they’re attached to the pack bag and not the framesheet, so less effective than a pack with a perimeter wireframe.
The addition of a single aluminum stay has increased the load-carrying capacity of the Scream 55 and I’d rate it max comfortable weight capacity at 35-40 pounds based on my experience hiking and backpacking with it.
|Make / Model||Weight (oz)||Type|
|Gossamer Gear Mariposa 60||30.5||Speed flap|
|Granite Gear Crown 2 - 60L||36.7||Roll top, Top lid|
|Granite Gear Blaze 60||48||Roll top, Top lid|
|Hyperlite Mountain Gear SW 3400||32.11||Roll top|
|Osprey Exos 58||43||Top lid, speed flap|
|Gregory Optic 58||43.35||Top lid, speed flap|
|Zpacks Arc Blast 55||21||Roll top|
|Mountain Laurel Designs Exodus 57||18||Roll top|
|Mountainsmith Scream 55||45||Roll top|
|Seek Outside Gila 3500 (57L)||47||Roll top, side zipper|
|Sierra Designs Flex Capacitor||41.2||Top lid|
|Elemental Horizons Kalais||37||Roll top|
The Mountainsmith Scream 55 is a multi-day backpack that provides the carrying capacity and creature comforts of heavier packs in a lighter weight but durable form factor. Weighing just 2 pounds 15.6 ounces (actual), the Scream has features including large external pockets, a high-end hip belt, and an internal aluminum stay, that make it a good choice for hikers who want to transition to a lighter backpack without giving up the functionality of their older packs or breaking the bank. While the Scream 55 lacks the front mesh stuff pocket popular on most of today’s popular backpacks, the double-barrel pockets will appeal to hikers who still prefer closed pockets for the organizational and weather protection benefits they provide.
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