I stuck all the edges together with sellotape ensuring there were no holes for air to escape through.

When testing this idea I used a hairdryer to inflate the bag. This was successful however if the hairdryer was on a high heat, the bag then began melting.
I found that when the air couldn't escape from the bag, this then overheated the hairdryer and prevented it from working, and so this wouldn't be a practical way of inflating the bag.
If I were to develop this idea I would need to find an alternative method of inflating the bag, such as a fan (which would enable the air to escape when it needs to) or a vent.
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