When it comes to long term food storage, emergency preparedness and recreational activities we believe Mountain House to be the Number 1 choice. The tins are airtight, water tight and extremely robust. They have the additional convenience of a plastic lid to provide an airtight seal keeping the contents fresh for up to 7 days after opening. To rehydrate the contents simply measure a portion, add boiling water, leave to stand for 8-10 minutes, stir and you have a delicious meal in minutes. Correctly stored, these tins last for up to 25 years.