Here's a portable thermos that would fit easily into a motorcycle side bag, or even a day hike pack. Glamper warning!
The Zojirushi Bento Lunch Jar is a traveler's thermos that contains a stack of four smaller bowls. The smaller bowls are plastic, in different sizes and are microwaveable. The outer thermos is stainless steel, keeps two bowls of food hot or cold (though not both at the same time), two smaller bowls at ambient temperature, and is available in four colors.
The manufacturer's web page
http://www.zojirushi.com/products/sljae
Available on Amazon.com for $41, including a stainless spork and nylon carrying bag
http://www.amazon.com/Zojirushi-SL-JAE14SA-Bento-Stainless-Silver/dp/B000246GSE
Also available in a slightly smaller and less expensive size, the Ms. Bento.
The Zojirushi Bento Lunch Jar is a traveler's thermos that contains a stack of four smaller bowls. The smaller bowls are plastic, in different sizes and are microwaveable. The outer thermos is stainless steel, keeps two bowls of food hot or cold (though not both at the same time), two smaller bowls at ambient temperature, and is available in four colors.
The manufacturer's web page
http://www.zojirushi.com/products/sljae
Available on Amazon.com for $41, including a stainless spork and nylon carrying bag
http://www.amazon.com/Zojirushi-SL-JAE14SA-Bento-Stainless-Silver/dp/B000246GSE
Also available in a slightly smaller and less expensive size, the Ms. Bento.