What to Buy in US (Everett WA) Before Crossing into Canada

Lots of good info here. On the sometimes inadmissable product, rice, we were stopped entering USA and searched. They spotted a small plastic container in our motor home, with rice. If it had been in original packaging, grown in USA, it would have been okay. But as it was, from anywhere in the world, it couldn't be allowed through the border, and was taken. There could have been something bad in there with the rice, and at some point could affect rice grown Stateside.