[root@eeepc1:~]# du --max=0 -hc $(nix-store -qR /run/current-system) | sort -hr | head -n20
696M    total
109M    /nix/store/r9dbza2lhsnmj0078p46p7ql3cvrhn9z-glibc-locales-2.25
62M     /nix/store/g6s5p65nqmaw8qpzssj2jyhxsa4w0lcw-linux-4.9.27
46M     /nix/store/0rxia0hk1pr3qalfk3j5hq7r20szhm6r-python-2.7.13
43M     /nix/store/bxj5d7qqx6av8w3zdsvb58bsvf8vmdsb-perl-5.24.1
35M     /nix/store/pjj9npd844a0byw7rvynhr8lzds73fsp-git-2.13.0
25M     /nix/store/v118l84n4l5mpjscinh515vrw09a4n2j-grub-2.x-2015-11-16
20M     /nix/store/cr09b6qlng28k3gjs1i622ymx7zv747j-glibc-2.25
19M     /nix/store/z7rlbqafqcwvw87693k50qpighli46mc-systemd-232
17M     /nix/store/6kjqmrssv7kdaqxvk1gr2dkjn56b0kvb-subversion-1.9.5
12M     /nix/store/k4rmxzz9s11w7lhacgawi1hcbh65lnyn-glib-2.52.1
12M     /nix/store/7crrmih8c52r8fbnqb933dxrsp44md93-glibc-2.25
11M     /nix/store/vdav7rd3zmas44pa833z19p6zs2s6cbi-coreutils-8.27
11M     /nix/store/qgkw8ykz8059kk700asbr6f816lgw23h-texinfo-6.3
9.5M    /nix/store/89md85i52d9q360wim2m8606a8mp7lsg-gettext-0.19.8
8.4M    /nix/store/0rlh3a9xlypnp57qkzcnc7rrp4hjg7sz-groff-1.22.3
7.6M    /nix/store/v0bsg97y1zyrcqkg5pjzqh86cghxpgkn-util-linux-2.29.2
7.5M    /nix/store/f58dz1154ca755d8wpl3abnc2y77wz2d-tcl-8.6.6
7.4M    /nix/store/c3fmgg5dpcpxdfnynrd2s03f9fqyav12-ncurses-6.0
6.9M    /nix/store/lpsiiv7xxy3zz1cwnzapv5yl37qqxdcq-hwdb.bin