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Osprey Packs Switch 40+5 - 2500 cu in
When Osprey asked us what we wanted we told them this: “We want a pack that you can yo-yo with that carries your water and a shovel.” Osprey's answer: The Aquasource. It detaches from the main pack via 4 buckles and slides out from the back panel. It has one big zipper that opens at the bite valve for gulps on the fly. A second zipper allows access to the inside of the pack which bellows out just enough to carry food or your skins. On the outside of the pack, a bungee cord straps down a shovel. Next we said, “We want a designated tools pocket for a shovel, skins, a probe and crampons.” Osprey's answer: A separate snow safety gear compartment with slider lock-off that has organizers for a shovel, skins and a probe. Crampons fit there, too. “We want a pocket on the top of the pack to keep food where it won't get smashed.” Osprey's answer: A big shelf pocket on top that drops into the body of the pack to keep food in tact. Of course, we wanted backside panel entry into the main body cuz it's the handiest, and Osprey obliged. The panel-loading main pack has enough space for extra layers. Other great features include a front slash pocket with key clip, safety equipment pocket on the hip belt, foam reinforced sidewall crescents to keep the pack rigid, stowable and adjustable diagonal ski carry loops, reinforced ski carry straps, abrasion patches under compression wings that guard against snowboard edges, and reinforced wear points for horizontal snowboard carry. Can you think of anything else? Neither can we.
$188.95 
Switch 50 + 5 Backpack
Basically, this pack is an ass-kicker. The storage space is perfect for yurt touring and fine for bc camping if you are a minimalist. It is easy to adjust to whoever is wearing it. It is comfortable. The few compartments it has are well thought out, easy to get to and not too small. This pack is easy to use. By this I mean, when making it larger or smaller, or detaching items, you do not have to be a rocket scientist to figure out straps, connections, etc. Everything is in the right place. ...It's well thought out.
Great comfort
My wife and I are planning a trip/cruise to Alaska. I was trying to find something that would allow us to travel with minimal luggage and ease of transport. I made a trial packing using the Osprey Switch 40+5 and found that I could get almost everything that I will need for the entire 10 days. Plus, it is unbelievably comfortable as there is no weight on the shoulders and lower back. Being a retired spine surgeon who has also had spinal surgery, this is welcomed comfort. I am most impressed with the construction and quality materials.
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Training Tips
Anaeroic threshold is when lactic acid starts to build up in your body as your muscles are not getting the oxygen they require. This threshold is typically expressed as a percentage of your VO2 max - the amount of oxygen per kilogram of weight that a person can use in converting fuel to energy. Elite athletes threshold might be as high as 90% of VO2 max.
Efficient running position allows you to run farther and faster. Keep the heel raise to a minimum, relax your upper body and hands, keep your upper body poised and quiet.
If you want to make progess in your training, join a running group. A commitment to meet on a regular basis with a group of like minded individuals will help you keep your focus.
An efficient long distance running stride will have you landing on your heal first and rolling to the front of your toes.
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