Bankers box® Liberty storage box LIBERTY® Storage Box, String/Button Tie, Legal Size, White/Blue, 2/Pk Built for heavy daily usage and maximum stackability Strong and durable for stacking and storing essential files. Ideal for stacking without shelving. Maximum security closure. Offers up to 50% more stacking strength than any other string and button box. Easy one step FastFold™ set up. Maximum security box with string and button closure keeps contents secure, even if box is overturned.