Looking for good method to pack long term spare parts on long term
cruise - like a spare alternator, starter, diesel injector pump,
expensive things.

What I'm thinking is a very heavy gauge individual bags - something
like almost 1/8" thick. Taped up with the clear packing tape that's
about 2" wide. You need to be able to see what's inside.

The Seal-a-Meal and other vaccum pack stuff is way too thin to last on
a cruising boat for 6+ years.

I've found very heavy bags on the net - but you need to buy 100 or a
1000 at a time.

Also - looking for something to put in the bag as an anti-rust,
corrosion, etc inhibitor.

Any suggestions?