Recently got back from a Philmont trek … here's some data:
Philmont issued bear bags – the weight of ours averaged 4.3 oz EACH (= re-used grain bags … the average weight is for those that were not cut down because of the edges unraveling).
Everyone in our crew brought their own food storage bag anyway so we used those for overnight storage on the bear-bag hangs and basically skipped using Philmont issued bags because they would have been redundant in terms of both weight & use … plus, a benefit of this method is that it eliminated the morning "sorting out food" exercise – made for a quicker transition on getting breakfast and breaking camp).
We did use one Philmont issued bag (the only one we brought) for an "Oops" bag to store our lunches, dinners and misc for easy access that day.
Philmont issued bear ropes – the weight of the ones they issued to us averaged 1lb 8 oz EACH (dry).
Amsteel Blue – same length as Philmont ropes – the weight of ours averaged 5 oz EACH (= which is equial significant weight savings from the Philmont issued ropes)
Here is the outline of the techniques to avoid issues with use of this rope:
1.) To pull up loads effectively – these lines needed stick "pull handles". To accomplish this, small sticks needed to be wrapped with the rope. (The sticks are easily found around Philmont's camps)
2.) To avoid tangle issues when storing these ropes, they need to be daisy-chained (knitted) which works well
3.) … plus, for good LNT practice – use stand-off sticks to protect the tree trunks from the rope wrap)
These techniques are easily done & mastered (with a little practice). The ropes are VERY durable while having the advantages of saving a lot of weight, they don't become water logged from the rain and it will rain and they save a lot space because they store much smaller than the Philmont issued lines.