The Simblissity UnSlack Pack is an aftermarket "pocket" product that can be used with a variety of packs. The pack can be attached to a backpack's shoulder strap or hipbelt. According to the Simblissity website, the UnSlack Pack was "designed to solve the problem of how to carry a lightweight camera conveniently and securely during outdoor pursuits like backpacking, climbing or skiing." Reportedly some of the attributes include its ultralight weight material, its motionless Circumferential Compression Mounting System Design and its versatility for holding a variety of objects. For more detailed information on the UnSlack Pack please read my initial report.

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During the long-term testing period of two months, I have additionally tested the UnSlack Pack during two more summer backpacking trips. They included trips to Grand Island National Recreation Area in Michigan's Upper Peninsula and Lake Superior Provincial Park in Ontario, Canada. Total days of backpacking during this time period amounted to seven days. In addition the UnSlack Pack was tested during frequent trail runs. Testing locations included deciduous and pine forest, open plains, lakeshore and steep rocky trails. The testing conditions were at low elevation or altitude 600 ft (183 m) to 2000 ft (610 m), with mostly semi-warm to hot conditions and mid-to-high range humidity (50-95 percent). Temperature ranged from a low of 49 F ( 9 C) to a high of 86 F ( 30 C).

Can I easily get out of my shoulder harness with UnSlack Pack attached to it? It has never been a problem to easily exit the harness.

Will the attachment points on the pack irritate or cause discomfort? I only had a discomfort problem once and that is because the attachment belt buckle rotated as mentioned in my field report.

Will the pack stay centered and not bounce when I do? Will the Circumferential Compression Mounting System eliminate that problem? The pack stays centered on the harness if the Circumferential Compression Mounting System is adequately secure. If I forget to tighten and readjust the elastic cordage with the cordlock, the pack contents will bounce.

Will the attachment point and webbing be of sufficient size so that it fits around various sizes of harnesses and belts? They are of adequate size to fit all of my packs and harnesses. The waistbelt kit webbing is much longer and I rarely had to use that option. 

Workmanship/Durability: Will the materials used in the UnSlack Pack hold up to constant use? There aren't any worn spots or evidence of abrasive wear on any of the materials used in the construction of the UnSlack Pack.

Will the ladder-lock buckle, webbing, snap, Velcro closures, cordlock and compression cord perform over the long haul? All components are still in great condition. The Velcro closures still function as well as they did when I received the item. The webbing and compression cord have remained ravel-free.

Will the 70 denier Silicone-coated RipStop Nylon stay waterproof and the seams stay water resistant? While the UnSlack Pack has been subject to periodic rain, I haven't found any leakage through the material or seams. During rainy episodes I have been careful to fully secure the Velcro to fend off water from entering the inside of the pack from the top closures.

Will the stitching hold up to items being taken in and out of the pack hundreds of times? The stitching remains unbroken and the seams remain intact even though it was stressed hundreds of times by pushing and shoving items in and out of the pack.