Inclusion Criteria (per self-report): English-speaking; age ≥ 21 years old; chronic low back pain (defined as a pain in lumbosacral region or sciatica for ≥3 months), with an average daily back pain score ≥3 on a 0-10 numerical rating scale (question from the Brief Pain Inventory), treated with ≥30 mg/day of morphine-equivalent dose for ≥3 months; at least moderate CLBP-related disability (≥21 score on the Oswestry Disability Index); capable of giving informed consent; willing to complete the study activities.