Best in 7 days
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Ships within 48 hours · Estimated delivery Jun 21 - Jun 26
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Description
Sierra Designs Flex Lumbar 3–6L – Expandable Waist Pack for Hiking & TravelSierra Designs Flex Lumbar 36L Expandable Waist Pack for Hiking & Travel Small in size but mighty in skill, the Flex Lumbar 3 6 pack is a smaller, hip sized version of our Flex Capacitor backpack for day hikes, bike rides and casual outings. Thanks to our expanding gusset innovation, flexible carrying capacity comes naturally. Loosen it up to get extra space for bulky layers, snacks and trail accessories, or cinch it down to stabilize smaller loads.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
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Best in 7 days
Best in 7 days
Best in 7 days
Best in 7 days
4.6 ★★★★★
Based on 1595 reviews
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Product Reviews
★★★★★ 5
Perfect for whatever activity!
Size: Large, Color: B004
I bought these specifically for my postpartum journey, and I still wear them. They are so comfy & a perfect length.
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Reviewed in the United States on April 16, 2026
★★★★★ 5
Worth Spending
Size: X-Large, Color: B004
Super comfortable....
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Reviewed in the United States on May 26, 2026
★★★★★ 5
Warm and comfy thermal wear
Size: Small, Color: Navy
They are very soft, don't ride up. Clothes do not stick to them like other thermals do. The fit is perfect. They are warm and comfy. The quality is good, too.
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Reviewed in the United States on January 23, 2026
★★★★★ 5
Comfortable, well made, washes well, would buy again
Size: Medium, Color: Light Grey
I bought these as a gift for my friend who lives in cold country and she says she loves them and they wash-and-wear well and are well made. Also very warm. Very comfortable and the fit is right on size. I would order them again
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Reviewed in the United States on January 21, 2026
★★★★★ 5
Perfect
Size: Large, Color: Navy
Oooooo these are so nice and soft and so warm! I am a nurse and work in an old hospital that is getting remodeled and there have been days we haven’t had heat and I have been very happy that I purchased these. My scrubs glide very nicely over these and don’t add any bulk. Definitely worth every penny! The fit is spot on and they wash up really well.
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Reviewed in the United States on December 12, 2025
