Hi all. I'd like to modify some venous reservoir bags we have on hand for an experiment which would require cutting and resealing the bags. My thought is to use a handheld plastic welder, but I am still unsure. I thought the material of the product would be listed on the manufacturers' website, however I have not been able to track down that information. I would greatly appreciate any information or advise. Thank you in advance. Below are a couple of bags I have to modify.

Medtronic Adult Venous Reservoir MVR800 / MVR1600

Baxter, Fenwall (600 mL) Transfer Pack, #4R2023