A little off topic but I have 6 of the Pingi XL (450gm) bags of the silica type beads that I recharge in the microwave (I have an old one in the workshop).
http://www.pingiaustralia.com.au/How to recharge
Remove the string bow and place your Pingi with the indicator facing upwards on a plate (with folded kitchen paper underneath) into a fat and grease free microwave oven for the time specified below.
Pingi Mini: 3 minutes
Pingi Bag: 5 minutes
Pingi XL: 6 minutes, then remove Pingi XL for 5 minutes and dry microwave, and then place your Pingi back into the microwave for another 6 minutes.
The moisture indicator will change colour from light pink back to blue after recharging. Let your Pingi cool off and reposition the bow after 5-10 minutes.
Your Pingi damp absorber is ready for use again
These sell for around the $25 mark at I think IGA in the laundry section, eBay you can find a 12 pack for $216 with free postage which is great value.