By Bill Kleiman, update of May 20, 2022
I find it pleasant when driving the preserve and I spy one autumn olive out in the prairie and I have my little sprayer in the truck. I don’t need to remember to return to take care of the problem. Get the job done easy.
Below is a Stihl SG11 we use for basal bark oil herbicide, so mineral oil with about 20% broadleaf herbicide of Garlon 4. They hold about 1.5 quarts.
Although the directions for these state to empty and wash them with warm soapy water after each use, I fill them with slippery basal bark solution and have one of them sitting in a bucket in the bed of my truck year round, cleaning it once a year for good luck.
The Stihl SG11 costs about $35. I have been trying several of these for about a year and they still works. Amazing! The tip is not adjustable which is one weakness. It sprays a cone pattern only. So you want low pressure and get very close to the stem. Some find this is cone only pattern is not good for them. The tip and its mount are stout. It has an orange pressure release on the side for storage.
For about a year I have been trying the Birchmeier brand “Superstar 1.25” of these sprayers at $70. I like it too. The tip can pivot up and down which maybe helps with some situations. And the brass nozzle tip is adjustable for cone or stream. It is very well made. Both can release the pressure when you are putting them away in your vehicle.
grassland restoration network 
Thanks for this, it made me laugh. For what seems the whole time I have been using hand held sprayers I have tried to find just the right thing. I have even tried swapping parts and making a “Frankenstein ” bottle!
I, too like the Stihl sprayer. I don’t like the spray tip that you can’t adjust to a stream so I fitted it with a different nozzle from a sprayer I hated in general but loved the nozzle! Now all I need to figure out is how to fit it with a flexible fuel line with a weight so I can use the bottle at any angle and actually use all the herbicide in the bottle without having to refill! The struggle is real. After I figure all this out I will probably hit it with my chainsaw accidentally when working and have to start all over. Haha.
Look up the Birchmeier hand bottle sprayer on 4 Control site. They angle the tip. This may be what you are aiming for.
Does the non-adjustable tip on the Stihl spray a fan or stream?
Stihl sprays a moderate fan pattern