The volume of the bag — the main “capacity” — about 56 dm3 that allows to put it 25-30 kg of cargo; the tube has a 25 dm3 — another 10— 12 kg, the upper valve 15 dm3 — 5-7 kg, side pockets 10 dm3 — 8-10 kg. it Turns out that this backpack can hold up to 60 kg of various items needed on route. This is, perhaps, the maximum weight for sports hikes even higher difficulty, and mostly such loaded containers are only for transportation to the start and on the way out. Due to the large load, special attention should be paid to the shoulder straps the straps: they are made much wider than normal, but harder (due to the layering. At the bottom they are attached to the locks-polukoltsami, sewn on straps, 100 mm above the bottom of the backpack. Made and weight belt, Mat-“spin:” of foam with a thickness of 15— 20 mm, placed at the rear wall of the bag: it acts as a solid machine and, in addition, forms styling, allowing you to place here the most important and hard things. All ego allows you to more evenly distribute the load on the shoulders, to get her partially on her hips, fixing the position of the lower part of the structure, to unload the spine, which greatly reduces fatigue on long journeys. Moreover, this backpack makes it possible to shift the center of gravity in the optimal position closer to the back of the camper.
Fig. 1. Padded modular backpack:
1 — a cargo belt. 2 — banana 3 — side pocket, 4 — bag, 5 — handle, 6 — shoulder belt 7 — tube. 8 — a protracted strap. 9 — the top flap.
The front of the bag is supplied with two pairs of rings; to them using rubber bumpers with hooks, for example, the expanders you can attach things that should be in the way to be, as they say, at hand: jackets, capes, mosquito nets, etc. In “bananas” in the cargo zone are placed normally, of photographic, film, phones, lenses and repair kits. And the backpack was easier to lift, to move from place to place, put in car, in the upper part of the sidewalls are sewn handles with double-folded tape.
There are various ways to adjust the volume of a backpack. For example, very common side lacing. However, the use of it leads to excessive increase of the tank diameter, and puts the center of gravity of the load backward from the optimum position, that is, increases the overturning moment. As the paradox: the more weight you have to carry in a worst-case distribution. Lacing besides prevents to Wade through the shrubs, riparian thickets. Backpack large diameter usually gets stuck between trees, in narrow passages. These considerations led to the formulation of the tube and the top of the valve.
The valve is provided with a fastener “lightning”, making it fit the things most needed in this part of the route. Because the fastening to the backpack allows him to move for several long straps, it is possible to adjust the position of the valve. The valve is removable, and it is often used as shopping bags in the road. Side pockets are also removable. They can also be used separately as small backpacks for reconnaissance and radial outputs. To the bag they pressureviagra using belts and tapes sewn on the side.
Modern backpacks are made usually of synthetic fabrics, high strength and light. Unlike, say, regular tarpaulin, they are not frosted over and not dubeet in the cold, do not swell when wet, and dry out quickly after rain. It is best to bag and valve to use nylon avizent less dense or more technical nylon. Thinner fabric is to put not recommended, as they greatly stretch and not hold form. However, their successes sew side pockets, rod tube, banana-belt. And you can combine, for example, to make a bag bottom made of nylon cords or of rubberized fabric.
Fig. 2. Cutting the main part of the backpack-bag:
1 — handle, 2 — side, 3 — tape fastening side pockets, 4 — lock crossbody strap (two half rings), 5 — shoulder belt. 6 — loop 7 — patch strip gain, 8 — back. 9 — tightening the belt 10 guide weight belt, 11 — bottom 12 — washer, 13 — lock tightening strap (two half rings), 14 — in front.
On shoulder and long straps, a weight belt is a nylon belt cord. As the fixing yarn” use a metal washer. The fasteners need to choose plastic, with large teeth.
Cutting avisenta (and other synthetic fabrics] conveniently lead using soldering iron, soldering iron tip which is sharpened boat on a sheet of plywood on metal a square or ruler. At the same time and fused edges of the fabric.
And now for the “Assembly” of the backpack. It rational to pursue in this order: on the sidewall of the bag to sew the handles and tape under the straps to fasten the pockets to the bottom of the buckle and ribbon, sew the front loop. Then connect the back, sides, front and bottom, to secure a protracted straps. Next sew a strip of material to support weight belt (70 x 240 mm), straps, paving for him to gain another layer of fabric (70X400 mm), and finally the sides of the bag to the bottom. Close up all the seams of the bag, sew a tube and attach the rest of the pack.
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