A method of fabricating reclosable bags comprising: disposing a releasably engaged closure between a first and a second bag film portions, the closure including a loop-engageable fastener strip comprising an array of loop-engageable fastener elements integrally molded with a sheet-form resin substrate, and a loop strip comprising a plurality of loops carried on a sheet-form resin base; and applying energy to bond the resin substrate of the loop-engageable fastener strip to the first bag film portion and to bond the resin base of the loop strip to the second bag film portion; wherein the loop-engageable fastener strip is not bonded to the loop strip when the energy is applied.