Sometimes the meat gets stuck in the bottom corner of the pouch of pre-packaged foods, and it's not easy to get everything out.
ーSometimes the meat gets stuck in the bottom corner of the pouch of per-packaged foods, and it's not easy to get everything out.
「時々、レトルトフードのパウチの底の隅に肉が引っかかって全部出すのが難しい」
to get stuck で「引っかかる」
「袋のまちの部分」は in the bottom corner of ...「…の底の隅」のように言うと良いでしょう。
per-packaged foods で「レトルト食品」
to get everything out で「全部を出す」
ご参考まで!