I have owned the Arc Blast for a year. The longest trip I utilized it on was ten days, with multiple weekend and overnight trips. My load varies from 19 to 23 pounds. To give you an idea of what this pack can hold, my winter kit looks like this- a Warbonnet 1.7, with Jacks r Better undercover, a baby orca, a Hammock Gear cuban tarp w/doors, down sleeping bag and a Thermarest Prolite pad, along with clothing and food for five days. All the gear fits comfortably in the backpack.
DESIGN
The Arc Blast is a top loader, with a removable carbon fiber frame, shaped in a H formation ( the new frame has two horizontal bars for more stability, instead of one). The curve of the frame is adjustable by tensioning the mesh back panel. In the winter I adjust the frame for no curve, in the summer I adjust for a slight curve, just enough to create an air gap between the pack and my back. The default / medium torso height on this pack will fit a 20" to 21" torso as measured. Taller and shorter torso heights can be selected. The pack is constructed of 2.92 oz/sqyd Cuben Hybrid fabric. This material is Cuben Fiber on the inside with a protective layer of 50 denier Polyester on the outside. The material has the feel of a thick, waxy paper grocery bag. I have snagged this pack on branches, briars and car doors. At this time, there is no evidence of damage to the Cuben Fiber. I do not drop this pack on the ground, I place it on the ground as you must be a little nicer to ultralight material.
The pack comes stock with a roll top velcro closure designed to keep water out of the 3,200 cubic inches/52 liter volume pack. When I order this pack again, I will ask Joe to make the "throat" of the pack longer. If he added 6 inches to the throat, the top would roll better when the pack is fully loaded for a long winter trip. Pack has a haul strap, which I use to attach the empty pack to my hammock suspension with a carabiner.
The 3/8 inch padded contoured shoulder straps and belt have a daisy chain for clipping on items. An adjustable sternum strap is included in the basic package. There are 3 size belts to choose from. Choose the largest belt that will fit you. The straps and hipbelt are comfortable/they are not breathable and tend to be a little hotter than padded, conventional cloth straps and hipbelts. The hipbelt is sewed to sides of the pack and is not removable.
The arc comes with 2 bottom side pockets, constructed of cuben fiber with a drain hole in the bottom and elastic top seam. Side pockets are sized to fit 1 or 1.5 liter bottles. They are positioned low on the pack and slanted forward for easy access without removing the pack. I carry my water bottles on the shoulder straps, so I cannot comment on the ease of access. I have my cook kit in one side pocket with space left over. My other side pocket carries my lunch and snacks, fleece cap and glove liners. Pockets are 11 inches deep at the back seam and 7inches deep at the front seam, 4 inch bottom seam, and 11 inch top seam with toggled closure. No issue with the space of the side pockets.
Large stretchy, clear view, mesh center pocket is great for quick access items. Mesh pocket allows air circulation to dry your wet tarp stowed in this pocket. Pocket is approximately 13 inches wide and 15 inches tall. You can haul a lot of gear in this pocket. I, at times, have had a ballcap, maps, wind jacket, trail guide book, dry tarp, snow stake and large lunch in this pocket at one time.
Side compression straps are made from non-stretch Dyneema cord for squishing down the pack volume. They also allow you to stand tall items like trekking poles in the side pockets.
A top strap (one), and base straps (two) allow you to lash on extra items to the top or base of the pack. The straps come off if you don't need them.
A centrally located Hydration Port is included to string out a drinking tube over either the left or right shoulder. A water bladder can either be hung from an internal hang loop, or laid horizontally on top of your gear. I have never used this feature and cannot comment as to its effectiveness.
All standard Bear Canisters, including the Bearikade Expedition and the BearVault 500 will fit in the upper half of this pack standing on end. There is enough extra girth to either wrap a foam pad around the canister (if you use one), or stand a Medium stuff sack vertically beside the bear canister. I have never used a Bear Canister and cannot comment on this feature.
Options Available/ I choose 2 top side mesh pockets, load lifters, and 2 cuben belt pouches. The 2 top side pockets have a loop at each corner to connect them to corresponding loops on the sides of your pack. Since these are not sewn to the pack you can still stand tall items like trekking poles, an umbrella, or a fishing pole behind the pockets. The pockets can be taken off or added later. The dimensions are roughly 6" wide x 3" deep x 8" tall. The load lifters are not really necessary, unless you like the feeling of pulling the load snug against your shoulders, which I do. The belt pouches clip securely to the daisy chain on your padded belt. These have taped seams and are completely waterproof from falling rain. They open with a single clip at the center. Each pouch has about 1 liter of volume.
Joe has other options and photos of the Arc Blast backpack which can be viewed at http://www.zpacks.com
The total weight of my pack, with the options I previously mentioned, is 18 ounces/510.29 grams. The current cost for this exact pack would be $354.00 US dollars.
PERFORMANCE
The Arc Blast pack has always carried superbly. The pack cinches up to me nicely. The hipbelt is an adequate design and distributes the load of the pack effectively to the hipbelt by the H-style frame stay. I would like to see a removable hipbelt option. At this time, if you need a different size hipbelt you must order a new pack.
Hiking in the Great Smoky Mountains with 5 and a half days food with water, along with all my hammock gear and there was no discomfort or shoulder ache. On steep descents the stability and slim profile of this pack allowed me to keep the load closer to my center of gravity for a natural walking position. For carrying a load of 23 pounds I cannot find fault with the Arc Blast. The shoulder straps did not rub my neck, which is a plus in my book. I found the pack to be water proof in all day down pours. No water reached the inside of this pack. For uber-insurance, I use a cuban fiber roll top pack liner from Z-pack. Weight of pack liner is 1.9 oz/54 grams and price is $39.95. This pack is suitable for weekend hikes or thru-hikes.
All ZPacks gear has a one year warranty against defects in materials or workmanship. Returns or exchanges are welcome, even on custom gear. I have utilized Joe's service for a couple of years. I have found his products to be well made. Joe has always been amicable to any return I have decided to send back. Communication is through e-mail. I prefer telephone contact, but this is not an initial option.
The Arc Blast is the pack I intend to use on my thru-hike attempt in 2014. I will keep you'all updated on the wear and tear of this pack as I make my way up the Appalachian Trail. Hope this review helped answer some questions.
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