A few years after SD got their grubby little hands on the karrimor brand you could still get the odd good karrimor sacks. Well IIRC a few years after the designers at karrimor got the money to design some decent alpine / climbing sacks that were fast and light style of bags with a decent carry fit their weight IIRC.
I'm not sure if it's the same but when I last looked into karrimor you had to be careful but you could still get decent sacks among the cheap dross.
As a kid I used to go with my parents to the karrimor factory shop. Back then they were among the best with Berghaus in the UK. Not many other brands were available that were any good. I used to see their jaguar SA sacks for less money than you could buy 25 litre day sacks for in a normal retailer. The only issue with them was either an unpopular colour, sample colour not taken up or they had a fault. Those faults were like three lines of stitching instead of two. Certainly not a reason to sell at less than half price. Certainly not a weakness. BTW I couldn't afford, could but read brought up tight! It still had the same gold lifetime guarantee as a first quality version of the sack.
BTW if you've got an ancient gold guarantee sack in your possession along with the receipt, keep it. Karrimor still honour that guarantee. A mate can't justify replacing his old backpack because karrimor keep repairing it for the price of sending it to them. It always comes back with all nicks, tears, etc removed. Also cleaned and having done a trip with him after a repair I reckon it got a DWR type of proofing on it too.
He was hoping they'd try and buy him off with money for a new sack though.
BTW it was probably a 20 year old sack. Weighed about 1.5kg, which for an 80 litre extended capacity and the ability to carry 30 kg in comfort, it was light! My sack was a younger, same weight but killed me when I carried 28kg all in.
Sorry for the digression but I am another reminiscing about the karrimor of old. It's a ruined brand IMHO. Shop for something else. I wouldn't want to risk it even for free