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Not every pointer tucks with a jointer, While I might not, I can respect that. I like to use grout bags mainly for flat work, but to each their own.
Bon has a decent selection of grout bags, all made tough for the job. Pick one that works for you.
Bon's Economy Grout Bag (Clear plastic bag)
SUPER-FLEX™ SILICONE Heavy-Duty Grout Bag (Blue Bag)