I might go a little overboard but I ride solo a lot so carry some extra stuff. In my backpack which is bungee'd on the tunnel I carry: 12 Wet Fire tinders, 2 bic lighters, a Blast Match, 2 tea light candles, 36" duck tape rolled around film canister which has waterproof matches and 2 cotton balls in it, 6 8" zip ties, 30' para cord, Israeli tourniquet, roll of 1" med tape, QuikClot, CPR pocket mask, decent pocket knife, compass, pair of mittens, 6 hand warmer packs, 6 Jack Link jerky sticks, 2 snickers bars, Voile T6 shovel with wood saw in handle, 6'X8' orange tarp, emergency whistle, travel size pill container with ibuprofen, Alavert and Aleve. Strapped on top of that back pack is a pair of 36" Tubbs Mountaineer snow shoes. I tend to like to explore cool spots off my sled so when I decide to leave the sled the pack goes on my back and the shoes go on, works out pretty well and if I'm ever broke down I'll be loving those snow shoes.
One other thing I always do is send a text to my wife and my brother with my truck location, where I plan to ride and for how long. I absolutely do not deviate from that planned location and timeline unless I have cell service and can send an update text with the new plan. I wait for a reply from both to verify that they've received the update before starting the sled again. Both of them know that if I don't text within 4 hours of the end of the planned timeline to verify that I'm back at the truck they should notify law enforcement and my brother should start towards my truck location as he's usually 4-6 hours away by car. The most important part of this plan is me not deviating from the plan without them knowing.