Plastic bag will be fine, suck the air out of it. Keep them out of the sunlight, stored in a cool dry place. Helped a friend restore his '67 GTO about 9 years ago....used new NOS body mounts, etc. he had bought in 1978 and sealed in a plastic bag. They were perfect. Still are. The new, reproduction ball joint and tie rod boots he bought rotted and fell off the car before they were 6 months old and the car hadn't been driven yet. We ended up washing the original boots in kerosene and re-using them. The poly control arm bushings are now rotted and have fallen out of the car after a few years, so he is about to install NOS Moog rubber bushings that are 40+ years old. The poly bushings went maybe 200 miles. Old rubber is high quality and will keep if taken care of. Keep it sealed and ozone won't get to it. New rubber is terrible and starts to fail from the minute it leaves the mold.
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Jeff 
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