Egg in a bag

[MERLYPUSSEDOFF]

I've heard you can cook eggs in zip lock bags. Boiled omelette thingy? Where do I get the bags and is there a method - i.e keep the bag from touching the bottom of the pan.
I want to do Egg-in-a-bag for Cubs so need approx 30 bags.

Home bargains or B&M type shop would probably do them

We do these with Guides and just use ordinary supermarket (I use Sainburys or Tesco, as they're my usual shops) ziplock food bags. Boil a very large pan of water and don't let the bags touch the sides for too long, or they'll melt - occasionally bumping into the side is fine, but not for too long at a time. We've been known to use the hot water boiler and then use the water for washing up the plates etc. afterwards.

We get the girls to break two eggs straight into the bag, add a splash of milk and chopped ham/grated cheese if wished, and then close carefully, squeezing out all the air. Squish the egg mixture about from the outside of the bag. If we're using the water boiler or a very big billy we might cook a patrol's-worth at a time, but if the Guides are boiling their own water in their patrol billies we say just a couple at a time.