What is the Sirrus 36
The Sirrus 36 is all about breathable comfort for long days hiking out in the hills with enough room for spare clothing, food and the essential kit. It is the perfect for pack for any kind of walking or travel and thanks to the fully adjustable AirSpeed ventilated back system; carrying this pack will literally, be a breeze.
What is it made from?
The Osprey Sirrus 36 is definitely built to last and uses tough, durable nylon fabrics to ensure it can soak up the bumps and scrapes of an active life. The main bulk of the bag is made from a super tough 210D Nylon Crosshatch with a durable water-repellent finish to keep your kit dry during light rain (a rain-cover is included for heavy downpours). This fabric is reassuringly thick, yet light enough that you barely realise you're wearing the pack, even when fully laden. Heavier and more durable 420D fabric is used on high wear areas such as the base and sides of the pack.
What are the features?
Designed specifically to fit the female form the unique suspended mesh located on the shoulders, backpanel, lumbar and hipbelt contour and adapt to a wide variety of body shapes and sizes, basically creating a custom fit. Overall the women’s pack shape is narrower and deeper which allows for a greater freedom of movement and increases stability by lowering the position of the load to better suit a woman's natural centre of gravity. The shoulder harness is designed with different curves to create an anatomical fit for a woman's neck, shoulders and chest. Women's hips are conically shaped with a larger difference between the waist and hip measurements, so the hipbelt is shaped and angled to accommodate this difference, creating comfortable load transfer and increased support.
The main entry point is through a traditional double-clip lid opening to give easy access to the pack’s contents. This style of opening arguably affords better weather protection and improved compression of the load. In addition to the classic top loader opening, there’s a vertical side zip that enables you to access the contents without having to undo the top. This is really useful if you want to get at something at the bottom of your pack.
The main compartment can also be split in two using the built-in divider and toggles. This creates a separate base compartment for wet or dirty kit, or to simply organise your pack more effectively. This base compartment can also be accessed via a large zipped entrance at the bottom of the pack.
Inside the main compartment is a hydration sleeve with a little clip to stop the bladder from drooping down to the bottom of the sleeve. This is the perfect place to pop your Osprey Hydraulics reservoir.
Osprey equip the Sirrus 36 with a single walking axe loop and the unique “Stow-on-the-go” trekking pole attachment system is a revelation. This allows you to safely stash your trekking poles away when they are no longer required without having to remove the pack or pester a mate to do it for you.
Two side “InsideOut” compression straps pull the weight closer to your back, increasing comfort and carrying efficiency; they also stop gear from rolling about in a half full pack. So called because they can either be used inside, or outside the side pockets. Under the pocket they compress the pack and not the pocket, and over the pocket they secure the contents of the pocket and compress the pack. Simply thread the straps in the manner that suits your needs. Two further straps at base of the pack can be used for storing sleep mats or extra clothing; or can be completely removed if you just don’t need them.
Starting from the top, pockets wise, you get a zipped top lid pocket for quick access to kit that you need to get to easily, such as snacks and navigation equipment. Under the lid is a mesh pocket with an internal key clip, this is perfect for stuff you want to keep separated for safety and security.
The two mesh side pockets will easily take an insulating layer or a 1L bottle and feature a tougher fabric at the base to stop the mesh from being damaged by abrasion. There are two 3D zipped pockets on the hip belt that you can still gain access to even when the hip-belt is done up tight.
On the front of the pack is a large stash pocket, the perfect place to store soggy waterproof clothing or even a wet flysheet. On the outside of the stash pocket is another large zipped pocket, giving you oodles of extra space.
Right down at the bottom of the pack is a small zipped pocket containing the rain-cover. This cover is tethered to stop it flying away in the wind, or it can be completely removed to shed a bit of weight in good weather. The cover fits snugly over the front of the pack and is held firm with an elastic drawcord.
What is the back-system?
This is where the magic happens! Osprey have taken inspiration from their brilliant AntiGravity technology to create a seamless construction across the back-panel and hip-belt using highly breathable suspended mesh to create the AirSpeed Ventilated Trampoline Suspended back system. The whole system is made up of 4 main components:
1. AIRSPEED SUSPENSION – LightWire alloy frame creates low profile air space, optimising pack balance and ventilation. Effectively transfers weight from shoulders to the hips.
2. AIRSPEED SUSPENSION BACKPANEL - 3D-tensioned breathable mesh backpanel ensures supportive fit and enhances airflow and ventilation.
3. SPACERMESH SHOULDER HARNESS - Sewn-in Spacermesh made up of mesh-covered ventilated die-cut foam to enhance all that ventilation and comfort. The shoulder harness is designed with multiple torso size options and features Velcro adjustability.
4. SPACERMESH SEWN-IN HIPBELT – Featuring zippered stretch mesh hipbelt pockets and ErgoPull (forward pull straps) hipbelt closure. The hipbelt connects directly to backpanel mesh to eliminate seams creating a smooth and comfortable lumbar to hipbelt body wrap.
This seamless and continuous construction method transfers weight superbly and is incredibly comfortable and lightweight. The whole pack is suspended away from the back-panel to produce an air gap that allows superb ventilation even on the hottest days. It won’t stop you sweating, but it will make you feel more comfortable.
The Osprey Sirrus packs are one-size only, which keeps thigs simple, but they do have an adjustable Velcro pad on the shoulder harness that can be easily set to various heights depending on the user. Please remember that your torso length and not your height will determine the back length. For more advice on pack fitting have a look at our video below.
Underpinning all that comfortable, breathable AirSpeed mesh is a flexible wire frame to transfer weight to the hips and to provide stability. The frame allows a degree of flex to the pack, so when you’re striding out, your shoulders can move independently of your hips.
Summary
The Sirrus 36 features plenty of space for those who are heading into the hills for long days with all the essential kit. This pack also makes the perfect travel and companion, keeping you comfortable and well ventilated in sunnier climes.
-
Adjustable AirSpeed ventilated trampoline suspended mesh backpanel
-
Adjustable torso length
-
Base zip entry
-
Integrated & detachable raincover
-
Internal hydration sleeve
-
Internal key attachment clip
-
Removable sleeping pad straps
-
Side compression straps
-
Single ice axe loop
-
Single vertical zippered side access point
-
Sternum strap with emergency whistle
-
Stow-on-the-Go trekking pole attachment
-
Top lid access
-
Twin zippered hip belt pockets
-
Under lid zipped mesh pocket