Big Agnes Sweetwater UL 43L Backpack – Mercury, Medium | Ultralight Hiking Pack

Set the pace on your next adventure with the Sweetwater UL 43L backpack. This streamlined pack is built to fit like a performance vest, with running-style straps that hug your chest, back, and shoulders for a secure feel. The Mercury color offers a clean, versatile look for trail days and quick commutes alike. The 43L capacity is designed for fastpacking, overnights, and day trips where you want essential gear without excess bulk.

Designed to help you carry more with less bulk, the Sweetwater UL 43L uses a proprietary integrated frame system that transfers weight from the shoulder straps into the frame sheet and down to the hip belt. The Load Wrangler Plus fit system adjusts to your body’s unique shape, with load lifters, adjustable shoulder straps, and an integrated hip belt to keep your pack comfortable and snug on long miles. The broad, breathable mesh shoulder straps echo running-vest design, distributing load evenly while you move, and the torso-length can be fine-tuned with key slots in the frame sheet for a precise fit.

Storage and accessibility are thoughtfully designed. An oversized front stretch-mesh pocket and chest straps provide quick stash space, while exterior gear loops and bungee attachments support quick lashing of trekking poles or other items. The top-loading main compartment features an expanding spindrift collar that adds room when you need it and tucks away when you don’t. A removable rain cover adds a layer of waterproof protection, and the internal reservoir sleeve fits up to 3 liters with hose routing options to either shoulder strap. The pack also accommodates a 9-inch diameter bear canister for longer adventures.

Materials and sustainability are central to the Sweetwater UL ethos. The pack uses recycled nylon derived from discarded fishing nets, along with recycled foam, webbing, and trims where possible. Three high-performance recycled fabrics contribute to durability while helping minimize environmental impact. Available in All-Gender sizes Small, Medium, and Large, the Sweetwater UL weighs 2 lb 10 oz, making a compelling case for a lightweight yet capable daily-use pack.

Whether you are chasing a thru-hike pace, a fast overnight, or a stretch of weekend trails, the Sweetwater UL 43L is designed to support your gear and your rhythm. The combination of a stabilized load path, fit-adjustable harness, and practical storage options aims to keep you moving comfortably from trailhead to camp. Consider this pack if you value a streamlined silhouette, adaptable fit, and the credibility of recycled materials without compromising on function.

What you get with the design

• The integrated frame system transfers weight from shoulders to the hip belt for a stable, efficient carry.
• Load Wrangler Plus offers a tailored fit with adjustable straps to match your torso and movement.
• Ventilated back panel and mesh straps promote airflow while you hike or run.

Storage, access, and weather readiness

• Top-loading main compartment with expanding spindrift collar for extra room when needed.
• Removable rain cover adds waterproof protection without adding bulk.
• Internal pocketing supports hydration and gear organization while exterior loops enable quick lashing.

Sustainability and sizing

• Recycled nylon sourced from discarded fishing nets and recycled trims support a durable build.
• Available in Small, Medium, and Large with a total weight of 2 lb 10 oz.