Does it harm commercial compost to decant it from bag into an open container?

When I watch Monty on GW, he always has his potting compost in a big open container. I always store my commercial compost in the bag it came in...I'd love to decant it into an open container (would be so much easier to scoop!), but I assume it would dry out much quicker. Is storing it in an open container a real no-no?
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It also means I can work indoors or outside depending on weather as it's easy to transport.
"We don't stop playing because we grow old; we grow old because we stop playing." - George Bernard Shaw
Obviously if you have to add grit for potting on seedlings such as lavender take it straight from the bag and mix with grit.
'The power of accurate observation .... is commonly called cynicism by those that have not got it.
George Bernard Shaw'
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
I think Monty prepares and tips his compost into containers for the programme to make it easier to show us what he's doing. Also he can't be seen to advertise and the colours on bags would show what makes they are.