I got a full set of silverware for backpacking that collapses down to about the size of those folding reader glasses (plus a little hard storage case just like the glasses). It’s a spoon, fork, knife, and chopsticks. I think I paid $6 for the set. Not super high quality, since the focus was on weight and utility, but definitely does the job.
I don’t use it much anymore, but it was great for lunch at work, and is good when traveling (staying at hotels and getting takeout - no plastic trash!). I mostly keep it in my overnight backpack so it’s available whenever I’m not home and I can’t forget it.
I don’t really care about downvotes, but those of you doing so… you might want to actually look into the research behind it. I picked a couple of random links for it because there’s literally nothing special about any of it, along with an NIH article about brown fat recruitment. The science is solid. It’s not a magic bullet; it’s not a replacement for healthy eating or real exercise; it does work for raw calorie burning and for making your body system more efficient at staying warm through calorie burning long term. That’s what our bodies are made to do. It’s a great calorie balancing supplement with very little actual effort.
Shivering is a great easy way to burn calories, and increase the rate you burn calories later through beige fat recruitment.
This should NOT be used to replace healthy eating or proper exercise, but shivering burns gobs of calories to produce heat, and the brown fat (located mostly in your back around neck and shoulders, used just for producing heat from fat) recruits surrounding white fat and transforms it into beige fat (basically converts normal fat into leaky heat-generating fat) to increase the heat generation, and thus calorie burn, of subsequent shivers.
Here’s some links about it, if you are interested. It may not be actionable in the summer, but if you have a basement floor you can lay on, a tub of cold water, or access to a walk in freezer, you can get a healthy shiver going any time.
https://www.medicaldaily.com/shivering-more-effective-exercise-15-minutes-shivering-may-burn-more-fat-1-hour-working-out-268555
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8341719/
https://www.discovermagazine.com/health/shiver-yourself-thin-can-being-cold-help-you-lose-weight