My goal is to find something that's easy to get to, can store an extra sweatshirt, stocking hat & spare gloves while staying dry.

If the bag doesn't do the trick, maybe a small backpack is actually what you are looking for.
What you want to carry isn't heavy, so you won't notice the weight and probably won't even notice you're wearing it.
Easy to get to and if need be, you can take quite a bit more.

 

I'm wanting to have something to store & keep on the sled. I've never been a back-pack person and I don't want to start when I'm on my sled. Thank you for throwing out the option though.

 

From some guys for sale post on FB

 

I did end up ordering the RMK Essentials bag and it does fit and it has the exact room I'm looking for! It's waterproof (97% anyway) and will store a lite jacket and/or sweatshirt and a spare pair of gloves. Since neither the dash or under-seat compartment are waterproof at all, this is the perfect answer. I store a quart of oil and tow rope under the seat (my buddies ride Ski-Doo's, so I'd like to help them if needed 😂) and the dash area holds Insurance & registration, misc items in baggies along with spare heated shield cables and my hat.