1. Place a crate.
2. Apply this code to it:
clearWeaponCargo _crate;
clearMagazineCargo _crate;
_crate addBackpackCargo ["B_AssaultPack_Base", 1];
_crate addItemCargo ["U_B_CombatUniform_mcam", 1];
_crate addItemCargo ["V_HarnessO_brn", 1];
_crate addItemCargo ["H_HelmetB_paint", 1];
3. Export as mpmission
4. Try taking one of the items on a dedicated server.