cans

[15goddess15]

what properties should a metal tin can have?? for example less reactive so that a reaction with the drink inside doesn't occur?

[Teddio]

The metal should be non-toxic, have a low electropositivity or should form a passivation layer on the surface (eg. aluminium oxide on aluminium)
The metal should be inexpensive and easy to form into cans.
Tin-plated steel and aluminium are good contenders.

[jake-the-peg]

They also need to be rigid enough so that supermarkets can stack them high but not so tough that customers can't open them with a standard tin opener.

They also need to be cheap to manufacture and easy to recycle is good too