A staple cartridge comprising a cartridge body, staples, and a compensator is disclosed. The cartridge body comprises staple cavities. The staples are removably positioned within the staple cavities. The staples are ejectable from the staple cavities. The compensator comprises an implantable body, a shell contained within the implantable body, and a plurality of resilient members positioned within the shell. The shell defines an inner space. At least a portion of a resilient member of the plurality of resilient members is connected to the shell. The inner space is compressible. The inner space has an unruptured volume when the shell is in an unruptured state. The staples are configured to rupture the shell when the staples are ejected from the staple cavities.