Sea to Summit Trek TkI 30 Sleeping Bag

$299.00to $319.00
Color: Bright Blue/Denim
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For adventurers looking for maximum versatility at a moderate price, the Sea to Summit Trek TkI 30 sleeping bag offers traditional comfort and value, with an anything but traditional design approach.

  • Features

    • Tapered rectangular shape offers comfort and versatility
    • 650-fill-power Loft UltraDry Down™ certified to the Responsible Down Standard (RDS) offers insulation and compressibility
    • Vertical chest baffles prevent down migration and cold spots
    • 3D side-wall baffle maximizes loft right to the edge
    • 3D hood draws in tight when needed
    • 2-way #5 YKK side and foot zips provide ventilation
    • Oversize zip draft tube features antisnag material; neck collar draft tube seals out cold drafts
    • Large internal security pocket
    • Soft-touch 20-denier lining fabric is lightweight and highly breathable; 30-denier nylon shell is durable
    • Includes Ultra-Sil™ compression bag for compact storage
    • This bag is designed to zip with another (second sleeping bag sold separately)


    Many sleeping bags are rated for temperature by an independent testing protocol. REI and the broader industry now use the International Organization for Standardization (ISO) 23537 protocol, which improves on the older European Norm (EN) 13537 standard; you may still see older items in our assortment that were only EN tested. With either protocol, each bag gets a Comfort (or T-Comfort) rating and Lower Limit (or T-Limit) rating. The Comfort rating is the lowest temperature at which the bag will keep the average "cold sleeper" comfortable, and the Lower Limit rating is the lowest temperature at which the bag will keep the average "warm sleeper" comfortable. Ratings are based on a person wearing one long underwear layer and a pair of socks, sleeping on an insulated surface with a minimum R-value of 5.38. Many brands use the Comfort rating for women's bags and the Lower Limit rating for men's and unisex bags. Everyone's body and sleep comfort differ, and conditions of use (posture, clothing, sleeping pad R-value, wind, humidity, etc.) affect total insulation, so EN and ISO ratings are intended as a guideline to help you compare products, rather than a guarantee of warmth.
    View all Sea to Summit Backpacking Sleeping Bags
  • Technical Specs

    Best Use


    Tested Lower Limit

    30 degrees (F) - EN

    Tested Comfort

    41 degrees (F) - EN

    Temperature Rating (F)

    30 degrees (F)

    Temperature Rating (C)

    -1 degrees (C)


    Regular: 1 lb. 11 oz.

    Long: 1 lb. 14 oz.


    30-denier nylon

    Zipper Location


    Insulation Type


    Water-Resistant Down



    650+ UltraDry down

    Fill Weight

    Regular: 12 ounces

    Long: 14 ounces


    20-denier nylon

    Sleeping Bag Shape


    Fits Up To (in.)

    Regular: 72 inches

    Long: 76 inches

    Shoulder Girth (in.)

    Regular: 60 inches

    Long: 64 inches

    Hip Girth (in.)

    Regular: 57 inches

    Long: 62 inches

    Stuff Sack Size


    Stuff Sack Volume


    Compressed Volume





    Down certified to the Responsible Down Standard (RDS)

  • Reviews
    25 reviews with an average rating of 4.4 out of 5 stars

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