A device (1102) for containing bone graft material, comprising:a first shell member (1102a) defining a first portion of an inner sleeve (1112a) and a first portion of an outer sleeve (1114a) to form a first bone graft collecting space (1132a) therebetween；a second shell member (1102b) defining a second portion of an inner sleeve (1112b) and a second portion of an outer sleeve (1114b) to form a second bone graft collecting space (1132b) therebetween, the first and second shell members (1102a, 1102b) couplable to one another such that, when the first and second shell members (1102a, 1102b) are coupled to one another in a closed configuration, a contour of the outer sleeve (1114a, 1114b) substantially matches a contour of an exterior of a bone about which the device (1102) is to be employed.
