The Ultralight Waterproof Cotton Quilt Envelope Sleeping Bag bridges the gap between a traditional sleeping bag and a camping quilt — giving you the warmth of cotton insulation in a portable, waterproof envelope package. Designed for spring, autumn, and winter use, it’s the versatile sleep system for campers who want reliable warmth without unnecessary bulk. The waterproof outer shell protects against ground moisture and light rain, while the cotton fill delivers breathable, natural warmth that regulates temperature across changing conditions. Compact and lightweight, it packs down small enough for any backpack. Specifications Specification Detail Style Envelope / Quilt Hybrid Filling Cotton Weather Resistance Waterproof outer shell Season 3-Season (Spring, Autumn, Winter) Applicable Users Adults Portability Ultralight & compact Why Choose This Quilt Envelope Bag? Quilt-Bag Hybrid: Functions as both a traditional sleeping bag and a camping quilt — unzip and use as a blanket at camp for added versatility. Waterproof Shell: Keeps the cotton fill dry from ground moisture and light rain — critical for maintaining insulation performance in damp conditions. Natural Cotton Warmth: Breathable cotton fill regulates temperature naturally, preventing overheating in mild conditions while retaining warmth when it cools. Ultralight & Portable: Packs down small and light — i for backpacking, hiking, and multi-day camping trips. 3-Season Versatility: Handles spring, autumn, and winter conditions — one bag for most of the year. I For Spring, autumn, and winter camping Backpacking and multi-day hiking trips Campers who want a bag that doubles as a quilt Outdoor adventures in variable weather conditions In the Box 1 × Ultralight Waterproof Cotton Quilt Envelope Sleeping Bag 1 × Compression carry bag