Maxpedition Gear Field Book Cover We finish our bags with a triple coat of polyurethane for water resistance and add a Final coat of dupont Teflon fabric Protector to repel the elements. Only the best components and designs are used We Use complete YKK zippers and slides exclusively unlike our competitors who put YKK slides on generic zippers We add Military grade Nylon webbing for straps, handles, and modular attachment points. Genuine Dura flex buckles and hardware add strength and functionality Starting with large, unseamed panels of 1000 denier Nylon, we meticulously reinforce each stress point with composite thread. No unnecessary seams or polyester parts are used Overall exterior size approx. 8.5-Inch x 5.5-Inch x 0.75-Inch Fits Rite In The Rain Tactical Field Book (4-5/8-Inch x 7-1/4-Inch ) (sold separately) Dual zipper clamshell opening