I would also strongly NOT recommend traveling in OPT coz you never know what will happen, but these are the things you need to consider if you have to

Travel Outside the US

Documents to carry with you:

1.       
I-20/DS-2019 (with travel signature* dated in the last 6 months)

2.       
Valid Passport (valid for 6 months into the future on date of re-entry)

3.       
Valid visa (exceptions to Canada/Mexico/Islands for 30 days or less)

4.       
Recommended:  Carry proof of enrollment (past and future)

5.       
If on OPT – also carry your EAD card and proof of employment (strongly recommended)

6.       
If you changed immigration status while in the US – carry change of status approval notice (I-797)