筒
tǒng · HSK 7
tube
🧻 竹 bamboo + 同 tóng (phonetic) = a bamboo tube; 同 also cues the tǒng sound
筒 stacks the bamboo radical 竹 over 同 tóng, which carries the sound. Bamboo is hollow and cylindrical, so the radical fits the meaning tube or cylinder, while 同 tells you it rhymes near tǒng.
筒 — bamboo radical 竹 + tóng 同 (phonetic)
A semantic-phonetic compound. The bamboo radical 竹 on top signals the meaning, since early tubes and containers were made from hollow bamboo segments, while 同 below supplies the sound 'tóng'. The original sense was a bamboo tube, later broadened to any cylindrical container like a bucket or canister.