I don't know if there is some kind of weapon embargo against Iran for old but serviceable military rucksacks.
Should you know somebody who lives in Germany he could buy for you one of these rucksacks and bring it to you during the next holydays. I doubt that any airport will sort out such a rucksack if it's used as holyday luggage.
As you see, cotton rucksacks are sold used very cheap in Europe. That's a German shop here, but the best offers, the lowest prices are Italian army equipment.
Perhaps you can get it even cheaper in Italy or Greece and lower the shipping costs too.
If you are interested I could search for you in Italian web shops, as I speak a bit Italian. The communication with them you surely also can do later in English. Nowadays most Italians speak English too.
In Greek shops I can't search because I am unable to read it.
The first model here in the following list is the rucksack pattern that was used by the Russian army during the second world war. As they conquered Berlin in the end, there is obviously nothing wrong with this simple design. You just need to keep your packing list as short as possible in order to keep the weight as low as possible, but that is intelligent anyway.
That means if you can find a simple cotton sack in the right size you easily can modify it by hand to get such a well working rucksack.
The straps at the sides are meaned to attach a rolled blanket in horse shoe shape around the rucksack.
That is somehow old fashioned but it works very well. Like this you lower your load on the shoulders, because the rucksack is light and small and the wool blanket around it contains itself and doesn't need an extra bag.
In your position I would try at first to follow this way, because if you can find such a cotton sack it's the easiest and cheapest way you can do it.
Ihr Partner für Armeebekleidung und Ausrüstung aus Hildesheim. Schon seit 1920 gibt es bei uns neue und gebrauchte Bekleidung und Ausrüstung aus Beständen von Armee, Polizei, Zivilschutz, Grenzschutz, funktionell und verschleißfest.
www.raeer.com
Ihr Partner für Armeebekleidung und Ausrüstung aus Hildesheim. Schon seit 1920 gibt es bei uns neue und gebrauchte Bekleidung und Ausrüstung aus Beständen von Armee, Polizei, Zivilschutz, Grenzschutz, funktionell und verschleißfest.
www.raeer.com
Ihr Partner für Armeebekleidung und Ausrüstung aus Hildesheim. Schon seit 1920 gibt es bei uns neue und gebrauchte Bekleidung und Ausrüstung aus Beständen von Armee, Polizei, Zivilschutz, Grenzschutz, funktionell und verschleißfest.
www.raeer.com
These Rucksacks here are a bit more expensive, but if you know someone who lives in Germany he surely can buy it for you. That's approximately the value of one working hour of an engineer in Germany, and most Persians I met in Germany had very well payed jobs.
Norwegischer Jägerrucksack mit Tragegestell 1968 B Kaufen Sie Bundeswehr Bekleidung und Armeebekleidung vom Räer Hildesheim Bundeswehr Shop. Seit 1920: Sportlich - Robust - Räer!
www.raeer.com
Ihr Partner für Armeebekleidung und Ausrüstung aus Hildesheim. Schon seit 1920 gibt es bei uns neue und gebrauchte Bekleidung und Ausrüstung aus Beständen von Armee, Polizei, Zivilschutz, Grenzschutz, funktionell und verschleißfest.
www.raeer.com
If there are no insulation mats available in Iran, what I don't know, as I never visited your country and usually don't talk about camping with my Persian friends, you can replace it with a sheep hide. You just need a plastic foil sheed to put it under it to keep it dry.
A large wool blanket you surely can find.
A metal mug you surely will find too and also a pot of 750 ml to 2 litres capacity.
Optimal for 1 person is 1 litre, for two persons 1,8 to 2 litres are perfect. If you can't find a pot that already has a bail to hang it over a fire you simply can drill holes into the sides and make from a thick steel wire your own bail.
In shops that sell tools and material for building sides or farms we find everywhere easily cheap tarps with grommets in the corners and around the edge. They serve very well as some kind of tent. The best regular size for bushcraft use is 2 x 3 metres. That's is approximately the size that the British army gives the soldiers. These waterproof sheets are very cheap and work very well. They are also lightweight.
They just aren't optimal to fold and roll them together. That's why there are more expensive ones on the camping equipment market. But it really doesn't matter. You can use such a cheap building site tarp.
BAUHAUS Gewebe-Ösenplane kaufen bei BAUHAUS: 3 x 2 m, 140 g/m², Kunststoff Online bestellen oder Reservieren & Abholen im Fachcentrum
www.bauhaus.info
People discuss in internet forums the equipment that is offered in our shops, because it is offered. But you don't need that all to have fun in the woods!
You can take what you find, and old civil equipment works well. Especially the very old things from our grandfather generation were still made to work in an archaic environment.
I can find on every flea market enough old civil things to get very cheap a very good equipment together.