I like Alpkit, I really do, but.......silnylon costs me, in small quantities, not rolls, about £6.50 a metre at 1.40m wide (60")
So if you were to make the Rig 21 yourself, which goes for £75, you'd be paying 2,8m*4,5m*£6,5/1,4m² or £58,5 for the fabric.
For the Rig 7, costing £45, that would be: 2,8m*2,4m*£6,5/1,4m² or about £31.
The added £15 in Alpkit's price for both is quite reasonable for the labour and added details, isn't it?
(I don't have a clue about how much you would have to be paid to make this or how much the added details cost, not to mention I don't know how to use a needle properly
)
Then again, they aren't buying by the metre and probably have cheap labour so an other company might be able to do sell it cheaper I guess...
And apparently their material is at least a couple of grams lighter weight for the Rig 21:
4,5m*2,8m*0,098kg/1,4m² = 0,882 kg vs Alpkit's 0,883 kg including extras.
But, I repeat, I don't know anything about materials etc
Cheers,
Lasse