Ooo I like this question. Here's my list of unconventional must-haves.

• A tube of chewable pepto bismol tablets
• Ginger Gravol (I eat healthy at home, and eat a good amount of junk food camping, so GI stuff is crucial).
• Sound Grenade—for scaring off bears
• Super long tongs for over-the-fire cooking
• Traeger woodpellets & a smoker tube for my camping barbecue
• WD-40
• Duct Tape
• Aeropress and a french press (didn't get the FP on Amazon tho)
• Power pack. Best thing ever for charging devices in a tent. But also peace of mind for boosting a vehicle, if needed. It can also blow up tires, and other inflatables. Like this one here.
• Niteize Go Anywhere Lite to clip to my dog's collar.
• Rubber gardening gloves. For gathering sappy wood, or gripping wet logs.
• Welding glove(s). For pulling a 600 degree cast iron pan/pot out of the fire.
• Milwaukee flood light. Well worth the money.
• Stainless steel wine glasses
• Torch head and a propane canister. Great for starting a fire when it's wet outside, or still lightly raining.