Advantec WP018ZWS Whirl-Pak ® Sampling Bags 18oz / 540mL, 4.5 x 9 in, w/Strip, 500/PK

Sterile sampling bags for collecting and transporting liquid, semisolid, and solid samples
Composition:Blended polyethylene contains ethyl vinyl acetate
for transparency and strength
Convenient:Bags close easily and securely by whirling or folding,
use puncture-proof tabs to seal
Approved by the FDA and USDA for food sampling