I've been using an Avo Saver for about 2 years and they are brilliant. It has not worn out and the plastic is very smooth and doesn't stain so they are very well made. I didn't realise they could be bought at a supermarket! I am planning to purchase several as presents. There is an ebay seller selling them currently so if I can't find them at Woolies I'll go there.
This device works much better than foil or cling wrap because it squeezes out all of the air and keeps any new air from reaching the seed. After 2 days the avo is pretty well as good as first cut. I think the longest I tried was about a week and it was getting a bit over ripe generally, but the cut area wasn't much worse than the rest of the avocado.
I wouldn't advise using foil for two reasons: 1. It is aluminium metal which can be absorbed into the food in contact with it over a period of time. 2. (If you care at all about mother Earth) aluminium that isn't recycled, such as foil that is dirty with food, shouldn't be wasted because a huge amount of energy is used in its conversion from bauxite to metal. I avoid using aluminium that isn't able to be recycled. It's much better to use a device such as the Avo Saver which works better but avoids wasting aluminium.
