A sleeping bag liner does three things a sleeping bag alone cannot: it adds warmth to any bag, it keeps the bag interior clean so you wash the liner instead of the bag, and in this case it acts as a standalone bivy on warm nights. Built from Tyvek — the same ultralight moisture-barrier material used in ultralight backpacking gear — it breathes, packs to nothing, and lasts.
What's Included:
• Tyvek construction — ultralight moisture-barrier material, breathable but water-resistant, packs extremely small
• Sleeping bag liner mode — slides inside any sleeping bag to add warmth and create a washable barrier
• Bivy cover mode — use as a standalone moisture-proof shell over a quilt or on warm nights alone
• Ventilating design — Tyvek breathes to prevent condensation buildup inside
• 2 variants — regular and long size options
Perfect For:
Ultralight backpackers who want to extend a bag's temperature rating without carrying a heavier bag. Hostel and hut-to-hut travelers who need a sanitary liner. Thru-hikers managing bag cleanliness over long trails.
