>>40897140 (OP)
Go to a place NOT NEAR YOUR BASE if someone makes it so you can't even go within 500 blocks of your base you still need to be able to access your chest
Dig a deep hole
Put bow and arrow, at least a couple hundred emeralds and the Silica Gel Packets Desiccant things in your chest. Optionally also add stuff like a small sword.
Close chest up very tightly.
Put chest at bottom of hole and cover with dirt blocks.
WHEN YOU GO TO SPOT WHERE YOU WILL BURY THE CHEST LEAVE YOUR MAP AND COMPASS AT YOUR BASE DON'T BRING THEM WITH YOU. IF YOU HAVE A PHONE MOD OR MODERN CAR MOD DON'T BRING THOSE WITH YOU EITHER
final step
If you ever become homeless or whatever in Minecraft go dig up your chest and do PvP before jumping into lava
If you are making a stash in Minecraft don't bury it at your Minecraft base you live at in game bury it somewhere like a public park in the Minecraft server and make sure you bury it somewhere easy to find like next to some sort of landmark in the server.
Make sure to keep in mind how deep you bury it like how many blocks and what the frost line is if you have the frost line mod installed on the server. Obviously at least quadruple bag it if you have the plastic bag mods on the server with some very strong airtight bags from the mod and put plenty of dehydrating packets in each bag if you have a desiccant mod