Safe rule about the elusive Joe. Most likely you, the contents of your flash drive and your files are useless.
If your flash drive you will find a casual passer-by, he is 50% likely to be unable to crack, with a 50% probability he will be interested in. The remaining 25%, which is close to the Pareto principal (80/20, where 80% of the hacking is just not needed).
If your archives will be referred to as something neutral, not "Passwords from my accounts банке.zip" and the contents of the archives is hidden, in principle, safe.
The password must be not only complex, but long since bruteforcer for archives freely lie on the network.
But answering the question directly: Yes, it is possible to hack, because all archivers fragile to brute force.