FirstSpear features the Tubes X-Strap System that integrates with plate carriers front usinng tubes technology... "Some mission sets call for unique approaches to load carriage. Some of our Users at the Tip of the Spear need compatibility with a Free Fall Harness, others are spending a lot of time in an Armored Seat and still others are carrying a back plate in a Pack that they cannot take off or risk mission compromise. Designed to work with either the FS AAC family of plate carriers or Strandhogg this harness quickly Tubes into place and allows you to work with the front of your plate carrier in place without a back panel or cummerbund."