Backpacks - where to put the heavyweight?

Quick question, but when one packs a heavy backpack (the kind with a proper shoulder and waist band harness setup) do you put the heavier items to the top or the bottom of the bag? For general purposes the light and heavy items are around the same size so its a top or bottom (or middle) kind of choice.
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I'm going to guess that there's some kind of formula for this and some spotty faced whizz-kid, just out of medical school, has come up with a reason why you should pack it in a particular way to save damaging various parts of your anatomy.
Personally, I'd just pack it so that it's at it's most comfortable.
Personally, I'd just pack it so that it's at it's most comfortable.

Back when I was a Scout leader - we used to teach 2 rules:
Heaviest stuff at the bottom
Stuff you are most likely to need at the top
Putting the heavy stuff low puts the weight as close to the hip belt as possible.
It is usually more comfortable to carry the load on your hips than the shoulder straps.
Heaviest stuff at the bottom
Stuff you are most likely to need at the top
Putting the heavy stuff low puts the weight as close to the hip belt as possible.
It is usually more comfortable to carry the load on your hips than the shoulder straps.

As a structural engineer (not a spotty-faced medical whizz kid) I would concur with the majority.
Where possible, place the heaviest items nearest to the vertical load-bearing component of your skeleton. i.e. your hips
A heavy load around your shoulders will have the tendency to make you topple over backwards - thus making you lean forward - thus inhibiting your breathing. Thus you will be uncomfortable. [top marks to Bren]
PS: I wanted to be a spotty-faced medical whizz kid, but I wasn't clever enough



Jack
Where possible, place the heaviest items nearest to the vertical load-bearing component of your skeleton. i.e. your hips
A heavy load around your shoulders will have the tendency to make you topple over backwards - thus making you lean forward - thus inhibiting your breathing. Thus you will be uncomfortable. [top marks to Bren]
PS: I wanted to be a spotty-faced medical whizz kid, but I wasn't clever enough




Jack

what bag is it overread, i presume it's a camera bag, i have a tamrac exploration 8 and tend to have 2 camera bodies in there and 4 lenses one being the 70-200 canon f2.8 l is usm ii and extenders plus filters x 6 and extra batteries plus flash and laptop for quick viewing of images plus lots of other items.
Now that is what I call weight, but then the bag is designed for that and when done up the straps are very padded and it is surprisingly comfortable, it also holds the tripod securely as well.
Great bags for fitting every thing in.
Now that is what I call weight, but then the bag is designed for that and when done up the straps are very padded and it is surprisingly comfortable, it also holds the tripod securely as well.
Great bags for fitting every thing in.

It's a Lowepro ProTrekker 600 AW - and its got, most of my gear in it (which is something like 4teleconverters, 4 macro lenses, a 70-200mm and some cameras somewhere). Granted its a travelling weight not a trip weight, and thankfully the trains will be doing most of the carrying; but its great to get most of the gear into one bag for the trip home.
However I fully agree that a proper harness setup makes a massive difference. I have a MiniTrekker as well and its made wonderfully and can really take a heavy load without breaking, but the harness on it is very thin and the waist strap lacks any kind of padding at all. Really shows up when you're on the move with heavier gear and I found it sapped strength very fast. Good bag, just the harness that lets it down if you put a seriously heavy kit inside.
However I fully agree that a proper harness setup makes a massive difference. I have a MiniTrekker as well and its made wonderfully and can really take a heavy load without breaking, but the harness on it is very thin and the waist strap lacks any kind of padding at all. Really shows up when you're on the move with heavier gear and I found it sapped strength very fast. Good bag, just the harness that lets it down if you put a seriously heavy kit inside.

Any decent rucksack will have hip belts, so most of the load is down through your hips into your legs, the shoulder straps should really only be for stability.
Putting the heavy items at the bottom of the sack lowers the centre of gravity, which helps with balance. Also the rucksack tends to be further away from your body at your shoulders than at your hips, so heavy items at the top would tend to move your centre of balance backwards, making your position less stable and forcing you into more of a crouch.
Putting the heavy items at the bottom of the sack lowers the centre of gravity, which helps with balance. Also the rucksack tends to be further away from your body at your shoulders than at your hips, so heavy items at the top would tend to move your centre of balance backwards, making your position less stable and forcing you into more of a crouch.

Digicam -- Rucsacks should always be loaded with the heavier equipment at the top. In doing this you carry the weight up on your shoulders giving better balance and prevents backache caused by having the heavier stuff lower. Take a look at any expedition documentary - the load is always high so that the load is straight down through your legs, if the weight is low it tends to give you backache by pulling your shoulders backwards. If you were to load low and try to climb a mountain - you'd have difficulty and probably tumble backwards
The hip belt should be used but you can vary the postions by moving the load between hips and shoulders.
Have spent years doing hiking and serious expeditions and I find this the best method.
The hip belt should be used but you can vary the postions by moving the load between hips and shoulders.
Have spent years doing hiking and serious expeditions and I find this the best method.