If you have to compress it tightly, do so. It will be fine. Its repeated compression/decompression that 'damages' the down.. not so much the time spent compressed or the tightness of the compression (within reason). It'll take longer to fluff up after a long, tight compression, but won't be any more damaged than after being scrunched up in a ball and released.
Ideally, don't compress it at all.
If you have to compress it tightly, do so. It will be fine. Its repeated compression/decompression that 'damages' the down.. not so much the time spent compressed or the tightness of the compression (within reason). It'll take longer to fluff up after a long, tight compression, but won't be any more damaged than after being scrunched up in a ball and released.
Dont wash it. Thats what kills them.