There is a lots of guitar cabs, even with quiet small weight, but who knows what kind of tone. The descrition is use to be: "custom design", or any kind of "fantasy" speaker. The name You know about the speaker means heavy cabs, the light cabs are contains "fantasy" speakers. Here are very light 12 inch cabs with well known and widely used speakers. The cabs are with closed back, 44 * 45 * 25 cm size, black tolex, optional chain 1/4" jack output. Made of wood! Spruce sides, bottom and top, and plywood birch front and back. Setted with Celestion speakers, NeoCreamback - 60 watts, 8 ohm -, the neodymium version of well known Creamback speaker, and BN12-300S - 300 watts, 8 ohm -, this one is used in Quilter combos and external speaker cabs with its huge power and fat sound. More option for this cab for example the brand new Celestion NeoCopperback250 - with 250 watts, 8 ohm - fresh optimalized for guitar with huge power and good sound.
If You would need how they sounds, select the cab and listen the video! Not more, but true full range of guitar sound, no compromise, just around 8 kgs weight.