Hello and thank you for your question.
1) Keep it in cash and use a safe (place). This assumes that the risk of losing $8,000 does not warrant your potential investment earnings.
2) A Roth IRA may be another good choice, especially if your taxable income is currently down. These funds could be held onto in the case of BK (11 USC Sec 522(d)(12)) and could also remain accessible should you need them. Within a Roth IRA your investment options will include most traditional investments. In addition you may be able to claim a tax credit (see IRS Form 8880) and account earnings won't be subject to income tax if you do not withdraw them for a period of 5 years. Keep in mind that the amount you contribute to a Roth IRA may be distributed back to you without being further taxed.