In reply to
"Then I could never carry more than 52 ounces total in my Z1...It works fine with more."
You have mis-understood my sentence.
" IMHO, a pack should be less than 10% of the weight to be carried."
does not mean that total weight should be at most 10 times the weight of the pack.
It just means than whenever the pack weight is more than 10% of the total load, you could most probably trade in for a lighter pack.
because, after trying out many packs ranging from 280 gr to 3kg, for carrying between 2kg and 35 kg,
for ME and MY practices,
there is a correlation between the weight of a well-designed pack and its ability to carry.
I am quite happy with my quiver of :
- black diamond RPM 26 up to 6-8 kg .68 kg
- Deuter Aircontact 35+10 up to 15 kg 1.7 kg
- The North Face Snow Leopard 70l up to 25kg 2.3kg
- The North Face Catalyst Pivotal 75l did not go beyond 25kg 3kg
So I first choose what I need to transport (weight and volume) and then choose a pack. If the pack is more than 10% of my load , I look to the next size down.
YET It is true though that a similar rule could also work upward, because a pack frame, hipbelt, shoulder straps are ideally designed for a range of carrying capacity.
So Ok, I'll bite
IMHO, with today's innovations, with a goal of full-day walk in varied terrain over many days (my definition of comfort), a pack should be NOT less than 5% of the weight to be carried.
Have a look at http://www.backpackinglight.com/cgi-bin/backpackinglight/heavyloads.html second table.
All light packs for heavy loads in the article have a ratio Load/weight ranging from 10 (Lightwave Wildtrek 60) to 19 (ULA Catalyst).
Meaning, it is today possible to find packs for which
packs weighs are between 5 and 10% of the load.
Hence my rule... ;-)