The Flex Trail 40-60 is an ultralight backpack with a volume expansion system for hiking and trekking.
Wedge-shaped inserts on the sides of the backpack and a system of webbing straps help to adjust the volume of the backpack by increasing or decreasing its width.
This design provides a more stable and comfortable load as opposed to backpacks with an increased vertical part.
Lightweight aluminium suspension with a frame around the perimeter of the backpack provides good support and durability.
The straps, hip belt and back cushions are made of moulded foam with perforations and air channels and are lined with mesh material.
The hip belt with two voluminous pockets is equipped with a convenient "reverse" tightening system - to tighten the sling, you need to pull forward instead of backwards.
Thanks to its design, the Flex Trail 40-60 can be used for a wide range of activities: hiking, travelling and travelling, where it can also serve as hand luggage during flights.
To protect your backpack from dirt and heavy rain, it is recommended to purchase an additional Sierra Designs Flex Capacitor Rain Cover grey or its equivalent.

Features of the Sierra Designs Flex Trail 40-60 backpack:
- Volume, liters:   39-56  (2380-3417 in3)
- Backpack weight:  1.23 kg  (43.4 oz)
- Height, cm:  70.0  (27.6 in)
- Width, cm:    35.0  (13.8 in)
- Depth, cm:    27.0  (10.6 in)
- Materials:  150D Polyester Ripstop, 420D Polyester
- Suspension: perimeter aluminium frame
- Soft ventilated EVA foam cushions on the back in the lumbar and shoulder blades
- Padded ventilated EVA foam shoulder straps and hip belt
- Shoulder straps equipped with chest and stabilising straps
- Adjustable hip belt with large zip pockets
- Belt system size:   78.7 - 137.2 cm (31 - 54 in)
- Tie-down straps on both sides of the backpack to adjust the volume and hang equipment
- Vertical loading with U-shaped top zip
- Flat zip pocket on the top of the front
- Large elasticated pocket at the bottom of the front
- Side pockets made of elastic mesh with thick fabric inserts for a flask, poles or poles
- Large flat pocket in the lid of the backpack with a zip
- Textile loops for ice axes or trekking poles

Warranty
The warranty period is 1 year.
If a Slumberjack product fails due to a manufacturing defect, we will repair or replace it free of charge at our sole discretion.
This warranty applies only to original, unaltered and unmodified products and workmanship.
This warranty does not cover damage caused by accident, improper care, negligence, normal wear and tear, weather conditions (wind, rain, fire, animals, etc.) or natural fading of colours and materials.
This warranty does not cover consequential damages or any other damages resulting from any defect in the product.
Damage not covered by the warranty may be repaired at a reasonable cost.
Manufacturer:
Slumberjack or SJK was founded in 1959 in St. Louis, Missouri, USA.
For many years, the company has been producing sleeping bags for children, adults, double sleeping bags, tents and camping furniture, as well as a lot of related equipment.
Until the last moment, everything was produced in the United States, which greatly distinguished the company from all competitors and eventually turned it into a strong player in the outdoor equipment market.
In 2008, Slumberjack became part of American Recreation Products, Inc. (American Rec), which by that time already included Kelty, Sierra Designs, Ultimate Direction and others.
In 2014, the company presented a new direction - Tactical Hunting Gear, in which it formed and implemented multi-platform solutions for hunting, which included transformation, various combinations and were quite versatile. The company's innovative developments were implemented in various colour combinations - DST (Disruptive Shadow Technology), Kryptek and Realtree MAX-1 camouflage. Tactical Hunting Gear also includes pouches, mats and covers for weapons, as well as warm waterproof raincoats.
In April 2015, American Recreation Products (Slumberjack was part of this corporation) merged with Exxel Outdoors to become a leading provider of high-quality and innovative outdoor products and the largest sleeping bag company in the United States. The newly formed corporation united the well-known brands Slumberjack, Kelty, Sierra Designs, Ultimate Direction, Wenzel, Insta-Bed, Tadpool, Master-Sportsman, X2O-sports, and Serta.
Today, Slumberjack is the perfect modern solution for hiking and camping, with a wide range of backpacks, sleeping bags, tents, mats, camping furniture and accessories.
Slumberjack provides a wide variety of options for maintaining comfort during outdoor and open-air activities.
Slumberjack hunting backpacks and equipment are lightweight and durable, which guarantees reliability and allows you to fully concentrate on the hunt.