EMS has a very good selection of well known "light" gear, ultralight cottage brands they do not. I know of nowhere that does. As Brian said, an online w/return policy is your best bet. Use the search function on this site for some reviews, if you haven't already. Never hiked in New Brunswick, but we've backpacked in the Chic-Chocs and on Cape Breton. Hopefully, you put up some reports.
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Charlie