My opinion is that VX07 is a good choice if you’re on trail 80-90% of the time and when you’re off trial you’re going easy on it (e.g. not sliding down slot canyons in Utah). I’ve done a lot of “not easy on it” off-trail with my VX07 Hanchor Marble like dragging skis through alder for hours, and it still looks surprisingly good.
The face fabric of VX07 is 70D nylon, so it’s similar in durability to what HMG uses in their packs (they use a 70D polyester I believe on the outside of their hybrid cuben).
VX21 is the stuff to have if you’re spending a lot of time crashing through brush, alder, sharp branches etc. If you’re exposing the pack to a lot of rock (e.g. sliding down sandstone, dragging it up a rock climb) then VX42 is the stuff to have.
Regarding CF Tape – The inside of the VX fabrics has a light nylon (30D I believe) to protect the waterproof layer. This ensures the waterproof layer lasts much longer than hybrid cuben, but it does make it hard to seam seal (which is why Hanchor is choosing smart seam designs rather than sealing) and there isn’t exposed plastic that you can easily glue or tape to. If you do damage a VX fabric you can either glue it with SeamGrip if it’s a small hole, or for bigger stuff either stick on Tenacious Tape (basically nylon + adhesive) or get it sewn (ideally).
With regards to attaching an internal pocket, Hanchor says the Tuff is compatable with their “Multifunctional Organizer“. I’m not sure how that attaches, but it might be a good way to go if you want an internal pocket, although it might be overkill (4oz).
Regarding the side pockets, normally the solid fabric is a bit oversized and then it has an elastic in the top hem to cinch it smaller and thus create stretch. This would be similar to how the current pockets are in the Hanchor Marble, as that pack uses 70D nylon with elastic in the top hem. Lots of companies do this (e.g. SeekOutside). If the solid fabric pocket is designed well, then it’s just as easy to use a stretchier material. But if the pocket isn’t built with enough elasticity in the top hem then it could be too tight or too loose.
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