Atmos 50 Backpack

Atmos 50 Backpack

• 210D Twill Velocity Cordura®, 160D x 210D Window Ripstop Cordura®
• Airspeed Suspension system with LightWire Alloy Frame and 3D tensioned breathable mesh back panel with side ventilation
• Gender specific BioStretch™ Fixed harness with mesh covered perforate foam and slides adjustable sternum strap
• Gender specific BioStretch™ built-in hipbelt with mesh covered perforated foam and ErgoPull closure
• Hydration compatible, backpanel sleeve with hanger and dual side hose exits
• Floating top pocket
• Front stretch woven pocket
• 2 side stretch woven pockets with inner or outer compression
• 2 zippered hipbelt pockets
• Stow andGo™ trekking pole attachment
• 2 ice tool loops with bungee tie-offs
• Removable sleeping bag straps
• Volume: 2800cu in / 47L (Sm), 3000cu in / 50L (Med), 3200cu in / 53L (Lg)
• Weight: 3lb 4oz / 1.47kg (Sm), 3lb 6oz / 1.52kg (Med), 3lb 8oz / 1.57kg (Lg)
• Comfort range: up to 40lb / 18kg

Providing optimal ventilation without sacrificing comfort or support, the newly redesigned Osprey Atmos 50 Backpack carries your load closer to your back so you can log the miles like never before. This lightweight pack design certainly isn't the lightest on the market, but it the most comfortable and superbly detailed. Built with gender specific BioStretch Harness and Hipbelt for a secure fit and the AirSpeed Suspension system, the Atmos 50 can comfortably carry a load of up to 40lbs, making it ideal for active adventures, thru-hiking and superlight backpacking trips. Plenty of pockets keep you organized and dual hipbelt zippered pockets keep must-haves at your finger tips.

Purchase USD$45 or more and get free shipping. The Osprey Packs Atmos 50 Backpack is available through Altrec.com.

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Customer Reviews for the Atmos 50 Backpack

Sizing Chart

Step 1 - Pack Sizing

All Osprey packs, save the transit bags, are available in multiple sizes to fit a range of torso lengths. To find your torso length, have a friend measure your back along the spine from the level of your iliac crest (the top of your hipbones) to your C7 (the knobby bone at the base of your neck).

Step 2 - Hipbelt Sizing

To determine your hipbelt size measure around your hips, not your waist. A properly fitted hipbelt rides centered over the hipbones and needs to be very snug; after all it will be carrying the bulk of the pack's weight. The padded portion should wrap well around your hips, leaving a gap of 3 to 6 inches between the tips of the pads when securely tightened.

Crescent Series
Luna Series

Torso Length	Pack Size	Hip Measurement	Hipbelt Size
> 22"	XLarge	> 36"	XLarge
20-22.5"	Large	33-37"	L or WL
18-20.5"	Medium	30-34"	M or WM
16-18.5"	Small	27-31"	S or WS
14-16.5"	XSmall	< 28"	WXS

Aether Series
Ariel Series

Torso Length	Pack Size	Hip Measurement	Hipbelt Size
> 20"	Large	> 36"	XLarge
18-20.5"	Medium	33-37"	L or WL
18.5"-	Small	30-34"	M or WM
-	-	27-31"	S or WS
-	-	< 28"	WXS

Exposure Series
Switch Series [55+5, 40+5, & 25+5]

Torso Length	Pack Size	Hip Measurement	Hipbelt Size
-	-	> 36"	XLarge
> 20"	Large	33-37"	L or WL
18-20.5"	Medium	30-34"	Medium
< 18.5"	Small	31"	Small

Atmos Series
Stratos Series [34, 32, & 24]

Torso Length	Hip Measurement	Pack Size
> 20"	> 33"	Large
18-20.5"	30-34"	Medium
< 18.5"	< 31"	Small

Stratos Series [18 & 12]
Switch Series [18 & 14]
Daytool Series [Focus, Flux]

Torso Length	Hip Measurement	Pack Size
> 18"	-	M/L
< 18.5"	-	S/M

Waypoint Series

Torso Length	Hip Measurement	Pack Size
> 20"	> 33"	Large
18-20.5"	30-34"	Medium
< 18.5"	< 31"	Small

ErgoPull

Nearly all Osprey hipbelts use an exclusive ErgoPull design. It creates mechanical advantage to provide extra leverage in cinching down the hipbelt. The ErgoPull design also draws tension along the top and bottom of the belt, not through the center, so it distributes pressure more evenly over the padding and relieves direct pressure on the hipbones.

Step 3 - Harness

Osprey Crescent & Luna, Aether & Ariel and Waypoint packs offer interchangeable shoulder harnesses. Harness sizing usually corresponds to pack size, but your best bet is to try one on. A properly fit harness should terminate 2 to 3" beneath the armpit. Webbing should not touch the body. By breaking the hook and loop connection and sliding the harness up and down the backpanel the torso length can be adjusted up to 3". (see illustration).

Men's	SM	MD	Large	XLarge
Women's	WXS	WSM	WM	WL

Step 4 - Overall Fit

Once you have the correct size pack, harness and hipbelt, and the torso length set properly, it's time to put some weight in the pack (20 to 30 pounds of well distributed weight will do) and dial in the fit. First, snug down the hipbelt and harness. Connect the sternum strap (A) - position it about 2 inches below your collarbones and snug it down lightly. Finally, tighten the load lifter straps to draw the load solidly against your back. The lift straps (B) should come off your shoulders at a 45 to 60 degree angle in Osprey's ReCurve and Ethereal Suspension packs. In other models these straps serve more as compression straps and ride flatter; they may even angle downwards.

In a good fit, there should be no pressure points and no gaps between your body and the pack. With Osprey's ReCurve packs, final tweaking may involve custom fitting the aluminum stays to your back.