JAM Paper Multi Pocket Envelopes with VELCRO? Brand Closure. 2 pocket booklet envelopes have both pockets on front of envelope. Pocket 1 measures 9 1/2 x 11 1/2 and pocket 2 measures 5 1/4 x 11. Each pocket has 1 inch expansion. Available in Red, Blue, Violet, Teal and Clear. 2 Pocket Open End and 3 Pocket Velcro envelopes available.