tie up, bind, truss up, bundle
捆 centers on securing things together by wrapping or fastening: tying up, binding, trussing, or bundling.
捆 combines the hand radical 扌 with 困, which likely contributes the sound and may suggest enclosing or wrapping, fitting the idea of binding with the hands.
The hand radical 扌 beside 困 (which looks like a tree 木 wrapped inside an enclosure 囗) suggests hands wrapping something up tightly: tying, binding, or bundling.
For コン, imagine tying a bundle with a strong cord: the word 'cord' sounds like コン, and your hands are busy binding the bundle.