I've been using Baofeng UV82 for a couple of years and love them.
Dual band with FRS, GMRS, Ham Radio, and programmable to local SAR/EMS/Flight for Life frequencies and even has FM radio built in.
1 watt low and 4-5 watts high output.
Great battery life and easy to use and almost disposable at this price.
You can mount in a side pocket of your avi bag, mount on your body, mount outside of your avi bag, mount on your front avi bag straps or jacket pocket. Lots of options. I used to mount mind inside my avi bag but now I mount mine in radio holder case secured to the back of my avi bag and route cables neatly with zip ties so they don't interfere with deployment of the airbag.
$39 from Ebay
http://www.ebay.com/itm/like/191396651259?lpid=82&chn=ps
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Speaker/Microphone Options
BCA radiotype speaker mike:
1. You can use a speaker mic clipped to your front of avi bag or a pocket. May require you to stop or slow down to use it this way. I like this water proof speaker mic because it has optional ear buds that should make it easier to hear an initial communication.
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2. Helmet Speaker and Microphone: I use this system exclusively and love it. Single cord to helmet with quick release is easy to use and not obtrusive. Great sound quality and I use this ATV and sledding. I can remove helmet and hold helmet in hand without disconnecting and even hang it on sled handlebar without disconnecting. PTT button is mounted on front of left strap of my AVI bag and easy to use/find. Trail riders can mount PTT on handlebar. You can find cheaper headset/mic combos for helmets from Ebay but I went with planetheadset.com for mine.
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You can buy 4 Baofeng radios for the cost of a single BCA radio and have a radio that has great output and range. With an optional longer whip antenna, you can easily double-triple your range and extend battery life by using lower power output option.
I've used the radio for an entire day's worth of riding 6-7 hours without any battery issues. I do carry a spare in case of emergency situations. You can also get a battery pack that uses batteries (either rechargeable or standard batteries).
Although I carry a spot GPS tracker with emergency satellite 911 feature, I like the fact that I am almost always within range of a Ham Radio repeater station almost guaranteeing I have reliable comms if I get in a bind. Getting a Ham Radio license is easy with a little bit of study time and even easier nowadays since the FCC eliminated the morse code requirement a while back
For GMRS use, a license is required for this radio. Technically this radio is not legal for FRS use due to fact it has a removable antenna, has more than 1/2 watt output (output of BCA radio) but that is not an issue I'm overly concerned about in the back country.