Dedicated lockable storage on racks

[DeezJT]

I just ordered a rack and would like to know what's a good lockable storage option? i want it to be on the side but nothing too big.
Something similar to this that's lockable.

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[WhatExit?]

Link here:
www.jeepgladiatorforum.com/forum/threads/im-building-my-idea-of-a-perfect-for-me-gladiator-rack.27705/page-11#post-684069