The Wonderbag is a non-electric slow cooker that uses heat-retention technology to continue cooking food once your pan has been removed from the heat source.

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To cook, simply bring the food to the boil on a stove, let it simmer, and then put the pot into the Wonderbag. Cinch the Wonderbag tightly with the drawstring, and allow the food to slow cook to perfection for up to 8 hours.

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It works by retaining the heat within the pan, and maintaining this heat for several hours, helping to continue cooking the food without additional energy.

The Wonderbag can continue cooking food for up to eight hours, and keep your food warm for several hours after this.

It is important to boil your food before placing in the Wonderbag and transfer it to the Wonderbag as quickly as possible once removed from the hob. This helps to ensure the temperature of the food is as hot as possible from the beginning of the Wonderbag cooking process, thereby helping it to retain the heat for longer.

Using a Wonderbag is a new concept for most people, and as a result it often requires some trial and error - which can be part of the fun!

As the Wonderbag does not add additional heat to your food, make sure you get your food to a hot temperature before placing it into the Wonderbag. You can do this by boiling your food to begin with and transfer your pan to the Wonderbag as quickly as possible once removed from the heat source.

If cooking meat, start with smaller pieces and work your way up to bigger pieces once you have a good feel for the Wonderbag.

For more tips, visit our Top Tips page here: https://www.wonderbagworld.com/top-tips

We have three different Wonderbag sizes:

Small – suitable for pans up to 2 litres, and is ideal for serving 1 or 2 people

Medium – suitable for pans between 2-6 litres, and is ideal for cooking up to six portions

Large – suitable for pans between 6 -10 litres, and is ideal for large families or batch cooking

This is subjective and depends on your pan size and cooking requirements, so please check our sizing recommendations within this FAQ for guidance.

If you have doubts, we usually recommend going with a larger bag as this allows you to use bigger pans in the future, and allows you to tighten the bag and add additional towels to fill your Wonderbag if your pan is on the smaller size.

Small – suitable for pans up to 2 litres

Medium – suitable for pans between 2-6 litres

Large – suitable for pans between 6 -10 litres

This is a popular question! We recommend copper, steel, aluminum, enameled cast iron, cast iron and glassware pots.

If you have any doubts, feel free to email us: contact@wonderbagworld.com.

We aim to transfer the Wonderbag around the world as sustainably as possible by reducing the packaging size. This is achieved by shrink wrapping the Wonderbag, which means the item needs puffing up when it arrives to you.

Once you open the packaging for the first time, try moving the foam around and get air into the Wonderbag to puff it up to the correct size. If you find it still isn't puffing up, try placing it in a tumble dryer for a couple of minutes, this normally does the job!

The lifespan of a Wonderbag is dependent on how much it is used and how well it is looked after. We started selling Wonderbags in 2008 and some of these are still going strong, that’s nearly 15 years!

We use polyester fabric for the exterior, and re-purposed foam insulation for the interior, helping to divert a large quantity of material from landfill each year.

All Wonderbags are quality checked before leaving the warehouse, however if you find that your bag is faulty, please send an email to contact@wonderbagworld.com and we will do our best to help you.