Ursack-color choice, don't know fabric differences

Cleaning up a duplicate thread of sorts… here is your post from the other thread, Jane:

”White Ursack is made of Spectra, Black is made of UHMWP (whatever that is). One better than the other? Prefer black but if material in white is better then that’s the choice. Thoughts or experience?”

I believe the Allmitey (Black) is more durable at a cost of higher weight than the Ursa Major (White).

Spectra fiber is a type of UHMWP.

The Allmitey has Kevlar fiber too.

I decided against the AllMitey because the capacity is the same as the Ursa Major. The capacity of the Ursa Major XL is better than either. The AllMitey has the advantage of being “critter proof” but doesn’t have a larger capacity and is heavier.

From a color standpoint, I like white for three season backpacking. Seems easier to locate. Ultimately the fabric properties should match your needs, regardless of color.

White keeps contents cooler. Think of the chocolate. The material is fairly dirt resistant.

Thanks for all the opinions. Ah, so many things in life come down to “think of the chocolate”!
Being forced to stay inside so much due to smoke/haze has me digging into my files of maps and planning some trips for next summer. Some will be realized, some not, but it never hurts to plan how to use a new Ursack and my regular bear canister. Back to my maps!

UHMHP is Ultra High Molecular Weight Polyethylene.

Spectra is a brand name (from Warwick Mills) for Ultra High Molecular Weight Polyethylene fabric. There “might be” some kind of proprietary processing in weaving the fabric but the basic material of the fabric is the same.

The unbranded UHMHP fabric (that’s colored black) presumably has  the same strength specification as the Spectra branded fabric.

I think another benefit of white color is that it’s easier to see items inside the bag as apposed to looking into a black hole. I choose white trash compactor bags for my pack liner rather than black for this very reason as well.