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Garrett39310  
#1 Posted : 23 April 2012 15:32:40(UTC)
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Garrett39310

I am looking at the the Product Safety for one of our products and have identified that the contents of one of our developed backpack toolkits (developed before I started at the company) is fairly heavy and wondered if there was guidance for this. I have seen the manaual handling charts for front based lifting, but was wondering if a similar one existed for the back? Thanks in advance
mylesfrancis  
#2 Posted : 23 April 2012 15:46:41(UTC)
Rank: Forum user
mylesfrancis

You'll probably need to get a proper ergonomists opinion on this one as it's a totally different sort of "lifting" with the weight being transferred onto the shoulders/back by the straps etc. As a general hikers rule of thumb, the pack should be no more than 1/3 of bodyweight for a fit individual or nor more than 1/4 bodyweight for "Joe Average".
Garrett39310  
#3 Posted : 01 May 2012 08:33:02(UTC)
Rank: Forum user
Garrett39310

Thanks for the advice :-)
Rees21880  
#4 Posted : 01 May 2012 09:37:39(UTC)
Rank: Forum user
Rees21880

mylesfrancis wrote:
You'll probably need to get a proper ergonomists opinion on this one as it's a totally different sort of "lifting" with the weight being transferred onto the shoulders/back by the straps etc. As a general hikers rule of thumb, the pack should be no more than 1/3 of bodyweight for a fit individual or nor more than 1/4 bodyweight for "Joe Average".
1/3 of bodyweight? Interesting rule of thumb lol....I can recall my military service where we regularly "walked" miles with 110-120 pounds of kit on our backs.....it was so heavy that you'd put your bergen on the floor...'climb' into it and your mucka would pull you to your feet!!! Unless, of course we parachuted in....and then we'd have the additional weight of rigs etc but gravity helped here!!! (PS I've never weighed more than 12 stone!)
Steveeckersley  
#5 Posted : 01 May 2012 10:32:16(UTC)
Rank: Forum user
Steveeckersley

You might want to ask the post office on this one. Some years ago a substantial claim led to the post office identifying weights for Post bags. The problem is with this under the manual handling regs guidance is 4(1)(b)(i) Page 19 Individual capability. This in my opinion restricts the ability to specify weights. In the guidance, their is a complete misunderstanding regarding the picture of a man and a woman with KG weights in relation to body. Most people think that this is specifying weights you can lift. Actually its specifying sample weights with the ratio weight applied depending on position of object in relation to the Body. In other words the further the object is away from a central body point the greater the pressure (leverage / Muscle pressure) and therefore if 10kg is the weight of the object at the central body point = X pressure etc then the same pressure is exerted with a weight of 3 KG at say arms length at shoulder height.
Steveeckersley  
#6 Posted : 01 May 2012 10:34:48(UTC)
Rank: Forum user
Steveeckersley

Just one other thing a recent press release re Schoolchildren and Backpacks reiterated Musculo-skeletal problems especiall around the neck and shoulder area. Research of this was conducted over 20 years ago and it seems its been ressurected!
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