Answer:
It is weightless, you can see it. If you put it in a barrel it will make it lighter?
Always old, sometimes new. Never sad, sometimes blue. Never empty, sometimes full. Never pushes, always pulls.
I have legs but walk not, a strong back but work not. Two good arms but reach not. A seat but sit and tarry not.
What must be in the oven yet can not be baked? Grows in the heat yet shuns the light of day? What sinks in water but rises with air? Looks like skin but is fine as hair?
What flies around all day but never goes anywhere?
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?