These rectangular bags can be bought seperately or as a set of 4 :
(S)
(M)
(L)
(XL) 
(SET) 
(S) : w 32 cm - h 22 cm - d 13 cm
(M) : w 40 cm - h 26 cm - d 15 cm
(L) : w 45 cm - h 32 cm - d 17 cm
(XL) : w 50 cm - h 35 cm - d 20 cm
Handmade bags : sizes can vary.
Cocosac.