Taking the family (including our 9 YO T1D son) on a river tubing adventure. Pump will be on - no problem because it's waterproof. Want to bring one or more glucometers, and don't necessarily trust (or want) ziploc bags. Any recommendations for waterproof cases/bags to bring some D-gear in?
I've used SealLine dry bags in the past when canoeing/rafting.
I would visit a reputable outdoor store or potentially read reviews online to find out what others have utilized with success if you don't necessarily have a brand preference?
Check any outdoor store - especially one that sells kayak gear. "Dry bags" are waterproof material that has a roll-down top that will keep your gear dry, but is not intended to be submersed for periods of time. When I used one snorkeling, I had to put the most important things inside a second bag to ensure that they stayed dry as a few drips slowly get in. I would advise against the ultralight sil-nylon versions that are too thin - I've had several rip at the seem from mild use.
There are also hard cases from brands like Otterbox. These are often clear cases, that has a rubber seal and click shut. May not be best for hard objects since it will rattle around in the box. These are a bit beefy and heavy, so I've moved away from them.
A newer option these days are the clip shut bags. They make several sizes for cell phones and cameras up to tablets. This is what I use for my Dexcom, since it's clear and able to press buttons through. There is at least one specific brand that sells one designed for insulin pumps ("waterproof" by pump standards is only for 30 minutes), but otherwise anything without a tube should fit fine in these types of bags.