Is it too much to ask for a single product to be perfect for all situations? According to my research: yes, it is too much to ask.
There are some things I have been looking for in a camp sandal or shoe: 1) Weighs very little, 2) Is comfortable, 3) Doesn't break the bank, 4) Doesn't take up too much room, 5) Can be used with or without socks, 5a) If socks are used they do not have to be specialized--I'm looking at you Injinji, 6) Can be used for stream crossings, 7) Dries very quickly, 8) Any fool can make them, 9) Is somewhat durable when not abused.
I know, I know...I don't need to take camp sandals with me on a thru hike, but I'm gonna. You don't have to. I want to. So this is for those of who also wanna.
Because I could not find anything on the market, I made some. Here is how they came to be:
I thought old school Tevas would do the job, but they are 13 oz for a pair. Too heavy. Crocs weigh even more, although they are super durable and protect your toes. Lightness is my main concern, though, so I looked to minimalist running shoes: rubber soles with string holding them to your feet. I contacted Xeroshoes and asked them what a pair of 10.5 US would weigh. Answer: 7.2 oz. Getting closer but not quite there yet. I liked the idea of those cheap drugstore flip flops, but you can't wear those without specialty socks. Sometimes it's chilly at camp you would prefer to wear socks and keep your feet warm.
So I went online to Old Navy and bought a bunch of different sizes (b/c I don't know if they run large or small) and a few extra pairs for experimentation. At only $2.50 to $3.00 a pair it's not going to break the bank.
I removed the rubber parts that anchor the flip flop to your foot, grabbed some old para-cord from the workshop and looked at some lacing videos on the Xeroshoes website that the owner of the company had linked to. (He is really a nice guy and I will buy some shoes from him in the future as thanks for unwittingly helping me. He makes his shoes for minimalist running primarily and I am not a runner, but they might make cool car-camping sandals.)
I punched a few holes in the front of the flip flops in which to string the para-cord through, then made a few failed attempts and finally got what I think is the right set up.
You may say, "I don't like that there is a knot and exposed para-cord underneath the sandal." Noted. However, since I am only using these for super-light duty purposes (camp sandal) I don't think it will be an issue. And even if they do fail prematurely, I am only out about $4. My guess, though, is that you could even walk a few miles in them if something bad happened to your hiking shoes.
The ends of the para-cord are burned to keep it from fraying. There are multiple solutions to lacing, but this one is minimal and keeps the weight down. I bought size 10-11 for me, since I wear a 10.5 shoe and they are at least 2 sizes too big. I would get the 9-10 next time. For this test, though, I just cut the front of the sandals back with some heavy duty scissors. That's why they look ragged near the toes. The pair weighs 6.3 oz. I used the existing two rear holes where the plastic foot holdy-thing nubs were for the new lacing. The thong hole in the front I just left as is. You could put some duct tape or something over it if you wanted to.
To make these lighter you find a thinner flip flip sole. I don't know if the lacing would rip through it more readily or not. I'd have to find a pair and experiment. For now, these appear pretty durable, although I've only tested them around the house and in the backyard. As I find out more I will update you.
Enough. Here are some pictures: