Gulp Powerbait shelf life once opened

[YUKONPETEY60]

Wanted to submit this question for some advice...last few years been using jigs and gulp for fluke and I have acquired a pretty good stash of gulp...my question is does this stuff hold up from season to season? I keep my loose gulp in plano screw-top containers with plenty of gulp recharge juice, should these grubs and shrimps be good to go for next season? How about the stuff in unopened bags (where I never broke the seal)? I have some of these purchased in 2013 and wondered if they still would be good next summer? I figured its best to leave them in the air tight bag where I never opened it, but once opened I store the gulp in the plano screw top containers. Thanks in advance for any advice you can give!