bike helmet noise reduction Wind-Blox Pro Block Attachment, Noise Accessory, Wind Blocker Biking and Cycling Gear, Helmet Add-On with Adjustable Straps, Black : Sports & Outdoors Reduces turbulent airflow into Slim Color:MATTE GREEN/BLACK Black Travel Backpacks |

bike helmet noise reduction Wind-Blox Pro Block Attachment, Noise Accessory, Wind Blocker Biking and Cycling Gear, Helmet Add-On with Adjustable Straps, Black : Sports & Outdoors Reduces turbulent airflow into Slim Color:MATTE GREEN/BLACK Black Travel Backpacks |

Black Travel Backpacks | Nordstrom

The main compartment is fully lined with the soft velco-like material so you can place the dividers however you wish

Slim

Color:MATTE GREEN/BLACK

I doubt it’s built to remain waterproof with long-term, full immersion—but given that it floats (which I don’t doubt because it’s largely airtight when closed tightly), that wouldn’t become an issue for backpackers

Reduces turbulent airflow into your inner ear allowing better hearing and and reducing fatigue.