If I take tinned food with me I leave them in the tin.
I find a tin weighs nothing and it is also a more secure way of carrying the food (no zip lock to burst open!).
Disposal of a dirty tin is no more onerous than disposal of a dirty bag. I crush the tin and put it in a spare carrier bag I always take for removal of rubbish.
Personally, I've never seen the point of transferring the contents of a tin to a bag. The ony advantage to that, I suppose, is that a bag is softer and can form around other items for better use of space. But I find tins are pretty fairly shaped (round) and since they are full of contents anyway no space is lost.
I find a tin weighs nothing and it is also a more secure way of carrying the food (no zip lock to burst open!).
Disposal of a dirty tin is no more onerous than disposal of a dirty bag. I crush the tin and put it in a spare carrier bag I always take for removal of rubbish.
Personally, I've never seen the point of transferring the contents of a tin to a bag. The ony advantage to that, I suppose, is that a bag is softer and can form around other items for better use of space. But I find tins are pretty fairly shaped (round) and since they are full of contents anyway no space is lost.