Upload & Sell: Off
having just received a used F-stop Tilopa BC, can't give you much experience stories but... being in the garment/apparel business... here's some of my takes on it.
1) no matter what they say, no zipper is waterproof unless they use those special types seen on diving drysuits...
this includes the ykk zippers used by arc'teryx and gore etc...
it is merely a polyurethane coating placed on the back side of the zipper, slit for opening and a specially created/molded slider head to accommodate the zipper chain being on the other side.
2) bags are tough to waterproof... like said above, thousands of holes for stitching... and considering heaver needle/machinery used for the thicker fabrics... this is a weak point... and the sheer thickness and bulk of the seams make it almost impossible to seamseal... and seamsealing, if done, will be quite costly.
3) fabric is a nylon fabric with a clear polyurethane coating... bad thing about this is that it will eventually wear out/degrade, especially in corners...
being that F-Stop uses aluminum tube reinforcement, i was saddened to see that they did not opt to reinforce the section of the bag that comes in contact with the corner of the alum tubing... i saw that the fabric is showing a more rapid wear and tear in that area.
i would have loved to see a lining used to protect the coating,
i would have loved to see a separate compartment for the water bladder,
and i would have loved to see reinforcements where needed... but overall, it is a good bag.
no bag is waterproof...
i will be purchasing raincovers for this bag soon.