These are astonishingly good, so much better than all the alternatives it's almost embarassing, and it's strange anything else is still being sold.They are perfectly leakproof. If correctly sealed they will happily transport liquid about all day upside downThey're almost invincible. Have dropped full ones from the top shelf of the freezer and they've survived.They are very stain and odour resistant. Don't get discoloured by tomatoes or turmeric.Can't recommend them enough.