A slide rail kit is applicable to a rack. The rack includes at least one mounting structure having a first predetermined portion and a second predetermined portion. The slide rail kit includes a rail member and a supporting bracket. The supporting bracket is arranged on the rail member and includes a first mounting feature and a second mounting feature. The first mounting feature is configured to be mounted to the first predetermined portion of the rack. The second mounting feature includes an elastic member and a mounting member arranged on the elastic member. The mounting member can be mounted to the second predetermined portion of the rack in response to an elastic force of the elastic member.