Artwork problems delay more orders than production problems do, and they are nearly always avoidable.
Send vector
Vector files (AI, EPS, PDF with outlines) scale without losing edge quality and are what screen, foil-die and embroidery preparation all need. A raster logo pulled from a website will produce a soft, ragged edge that no amount of care in production can recover.
If vector genuinely does not exist, say so early — it can be redrawn, but that is a step with its own approval, and discovering it at sampling stage costs a round.
Outline your type
Convert all text to outlines before sending. Otherwise the file depends on fonts the factory does not have, and the substitution is silent — the first you see of it is a sample in the wrong typeface.
Specify colour properly
Send Pantone references rather than RGB values. Screen colour is not printable colour, and "match this JPEG" produces a guess.
Also accept that fabric moves colour. The same Pantone screen-printed on white cotton, on natural linen and on a coloured fabric gives three different results, because the base tone shows through. If exact colour matters, approve it on the actual production fabric.
Design for the fabric you chose
Fine detail behaves differently on every surface. Smooth cotton and canvas hold detail well. Textured linen and jute break it up. Pile fabrics like velvet can swallow thin lines. Foil rewards solid shapes and punishes hairlines. Embroidery cannot do fine detail or small type at all.
The practical move is to pick fabric and decoration method first, then adapt the artwork to them — rather than finalising artwork and then finding out which methods it rules out.
State the print area, do not assume it
The usable print area is smaller than the panel. Seams, closures, gussets and the way the pouch is held during printing all constrain it. Ask for the usable dimensions for your specific construction and method before finalising the layout, so the design is not built around an area that does not exist.
Artwork checklist
Before sending: vector format, text outlined, Pantone references included, artwork sized to a stated print area, placement marked on a drawing of the pouch, and every element you are unwilling to compromise flagged explicitly. That last one matters — if you do not say which part is non-negotiable, the compromise will be made for you.