Outdoor Research - Zip Sack

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Outdoor Research - Zip Sack

Availability: Out of stock

Stock #: 637E-

Zipper access on these sacks makes it easy to grab a fresh pair of socks or a warm hat without unloading your entire pack in the middle of the trail.


  • Webbing Handles on Ends
  • Water-resistant zippers
  • Water-Repellent Base
  • Durable Bound Seams
  • Durable




Small: 81/4" x 3" x 63/8" / 20 cm x 13 cm x 10 cm
Medium: 101/4" x 73/4" x 4" / 25 cm x 15 cm x 13 cm
Large: 12" x 91/2" x 41/4" / 31 cm x 18 cm x 15 cm


Small: 244 cu. in. / 4 L
Medium: 427 cu. in. / 7 L
Large: 671 cu. in. / 11 L

Average Weight:

Small: 1.1 oz / 32 g
Medium: 1.4 oz / 40 g
Large: 1.7 oz / 48 g

Fabric: 100% polyester, 40D with polyurethane coating // 100% nylon, 70D with TPU



A passion for human powered adventure inspired the birth of Outdoor Research, an outdoor gear company based in Seattle, Washington. And 27 years later, this passion remains as strong as ever. But OR’s goals have expanded to embrace a greater mission: their customers' experiences of human powered adventure. Over the years, they’ve learned it's not simply about what we think. It's about listening to their customers and building their ideas into OR products.

Truly useful gear is the result of a process that begins by paying careful attention to the needs of outdoor adventurers. By listening to these people, OR achieves a clear purpose for the functionality of each product. From this, they deliver what is the hallmark of OR products: functional gear that works and lasts. As a result of placing quality and function first they offer the finest guarantee in the industry — OR's Infinite Guarantee®.


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