The household kitchen "Foodsaver" vacuum packing machine and large bags is what I use for all spare parts
, pumps, alternators, starters, etc., etc. I get the rolls of large bags and cut them to fit the part and then use the vacuum sealer to vacuum pack the item. Sometimes if there are sharp edges I use double bags or put something in the bag to soften the sharp edge.
- - Alternators and other parts
were in perfect condition as much as 5 years after I packed them and stored them away in the bilge
FoodSaver Food Sealer Vacuum - V2040 : Target
For tools and such stuff I purchased a bag of 100 "shop rags" and laid one or two on top of the tools in a drawer or box and then soaked the rags with Boeing T-9. No rust on the tools during 10 years in the Caribbean