WHAT IT IS From the Core Collection. PLUS ULTRA's Bamboo Travel Case is made of Moso bamboo and keeps a toothbrush protected and clean when traveling. Its antimicrobial and antibacterial properties keep toothbrushes clean and protected. Moso bamboo. Imported. HOW TO USE IT Designed for the PLUS ULTRA adult bamboo toothbrush, it can also fit most other manual and power toothbrushes. Remove the cap, place a bamboo toothbrush head inside, and re-cap.