By now anyone savvy enough to be looking at a re-usable shopping bag on the internet will also be up-to-date enough to know why they are good, and why disposable plastic carriers are bad, so let's not go too deeply into that. It's safe to say it's better to make one immortal plastic carrier bag shaped like a grenade and use it for a long time, vs making 290* immortal plastic carrier bags and mush them into the ground after one trip to town to pick up a sandwich. This is the logic behind Green-aid, and the subtle way it delivers this message; wrapped as it is in a skin of ammunition-shaped fabric, it's kind of breath-taking. It's the same as buying one Italian sportscar in your lifetime vs 42 ten year old hatchbacks, kind of. And if you can compare it to a Ferrari then it must be worth £12, right?