My days of walking far afield are over. MS pulled the chocks on that.
A pack frame, to hold, ball of twine, a 6'X6' tarp, sheet rock saw, folding entrenching tool (shovel). Anvil pruner, in a five gallon pail that fits on your frame. Often some bottled water for the pack mule
In recent years more than foraging in the wilderness. I'll hobble to the nearest human who has activity I wanna collect.
Town crews mow the shoulder of roads and ditches. Upland blueberry (at the top of the bank) and larch (in the bottom of the ditch), a happy face (about all I can muster), or a pretty face, is often all it takes to charm a few of the trees worth being tray-trained that they over-see.
Your could be on the good side of acer palmatum growth. Again ask nicely and collect (often) your bloodgood seed, plant them promptly
let them overwinter outdoors in their pot.
I started collecting crab apple and apple-crab seed for homesteaders. Initially I collected larger fruited examples so they could make pectin. As I started wanting them for bonsai I picked only smaller fruited examples.
Plant apple seed in a shallow pan (with drainage holes) or sprouted saplings from your pomace pile,
Separate saplings 2 feet by 2 feet in beds and let them grow for a couple years. I ended up cutting out the strongest and longest leader every other year from bonsai candidates. By year six or eight I had a pretty massive stump.
A longer version is in "I never meant to do this" in the regular bonsai forum here.
The trees your most likely to need a back pack for are alder. Wellies or waders couldn't hurt either.
To one degree or another the best hearty trees for new bonsai hobbists tolerate wet feet. Serrisa figs and bald cypress are among the many.
Over watering is harder to unlearn than not watering.