You could always get a sleeping bag liner instead to use with the normal issued sleep gear. It's a smaller secondary sleeping bag to go inside your primary one. Something like this: Sea to Summit Reactor Insulated Sleeping Bag Liner https://www.amazon.com/dp/B01ASE6UYW/ref=cm_sw_r_apan_glt_fabc_W66S3EPE86GQM0H8NSWN?_encoding=UTF8&psc=1