I use a plastic outdoor chair cover. It is really light yet strong, have actually left the scope running underneath it and it tracked perfectly. I have attached rubber band in 3 places around the base to attach it to the legs of the tripod so it cant blow away. Rolls up to about 30cm long x 10cm round.
Only thing I suggest, is on dewy nights get a tea towel to put over your OTA, dew can still form on the inside of the cover.
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