I’ve stacked three 20 pound blankets before and concluded my toes hurt if I do that if I sleep on my back. One 10-20 lbs is a good compromise between maneuverability and comfort. These are the ones I have and theyre of acceptable quality, but not exceptional (the compartments had the string unravelling since its a straight stitch so it doesn’t really hold a load/stress, in my opinion). They get the job done though: https://www.amazon.com/dp/B07CBNYXYP/ref=cm_sw_r_cp_api_i_-lKMFbSMF3M1H?_encoding=UTF8&psc=1