@rotuts, I haven't sued them as I don't have any cause to, but I haven't used them either. I have used the spatula trick though and I have one of these: https://www.vacmasterfresh.com/vacmaster-vacuum-seal-tool-stainless-steel-construction-prep-plate/ but I hardly ever use it as these days the wife wants most everything unseasoned when I cook it. I usually buy my salmon from Sam's Club - I think their frozen filets are very good quality, not fishy and are already individually sealed. I just pop them in the SV and season afterwards.
@kayb, the different colors are supposed to be for different food groups to avoid cross-contamination.