Förpackningen ligger fortfarande i min väska.

Förpackningen is the definite form of en förpackning (a package/the packaging).
Swedish often uses the definite form when talking about a specific, known item (the one you mean in the context), even if English might still say a package sometimes.
Forms:

• en förpackning = a package
• förpackningen = the package

Ligger literally means lies (is lying). Swedish commonly uses “position verbs” to describe where something is:

• ligga = be lying / be located (often for things resting horizontally, or just “being somewhere”)
• stå = be standing (upright items, things on “their base”)
• sitta = be sitting (attached, snugly fitted, or seated beings)

A package in a bag is typically imagined as lying in there, so ligger is natural.

Sometimes, but it changes the feel.

• Förpackningen ligger fortfarande i min väska. sounds very natural and descriptive (location + physical placement).
• Förpackningen är fortfarande i min väska. is understandable, but less idiomatic; Swedish often prefers ligger/står/sitter for location.

In a main clause, Swedish typically follows verb-second (V2) word order: 1) Subject: Förpackningen
2) Verb: ligger
Then adverbs like fortfarande usually come after the finite verb:

• Förpackningen ligger fortfarande …

If you start with an adverbial, V2 still applies:

• I min väska ligger förpackningen fortfarande. (more emphatic/stylistic)

In a normal main clause, fortfarande typically comes after the finite verb:

• Jag är fortfarande trött.
• De bor fortfarande här.
• Förpackningen ligger fortfarande i min väska.

In subordinate clauses, it often appears before the verb:

• … att förpackningen fortfarande ligger i min väska.

Both can mean still, but usage differs:

• fortfarande is very common and neutral for still (continuation).
• ännu can also mean still, often sounding a bit more formal or nuanced, and it also appears in comparisons/time expressions.

Here, both can work:

• Förpackningen ligger fortfarande i min väska.
• Förpackningen ligger ännu i min väska. (less common in everyday speech, depends on dialect/style)

• i = in (inside something)
• på = on (on top of a surface)

Since the package is inside the bag, Swedish uses i:

• i min väska = in my bag
  If it were on top of the bag:
• på min väska = on my bag

When you use a possessive (min/mittt/mina, etc.), Swedish normally uses the noun in the indefinite form:

• min väska = my bag
  Not: min väskan

Definiteness is already expressed by the possessive.

It depends on gender/number:

• min
  • en-word (common gender singular): min väska (because en väska)
• mitt
  • ett-word (neuter singular): mitt hus (because ett hus)
• mina
  • plural: mina väskor

Väska is a general word for a bag, often a handbag/shoulder bag, but it can be broader depending on context.
More specific Swedish words include:

• ryggsäck = backpack
• handväska = handbag
• resväska = suitcase

So i min väska could be “in my bag,” with the exact type inferred from context.

A rough guide:

• Förpackningen ≈ fuhr-PAK-ning-en (stress on pak)
• ligger ≈ LIG-er (hard g sound)
• fortfarande ≈ FORt-far-an-de (main stress early)
• i min väska ≈ ee min VES-ka

Also note Swedish melody (pitch accent) matters, but getting the stress right is the main first step.

Yes, and Swedish will keep V2 word order (verb still comes second):

• I min väska ligger förpackningen fortfarande.

That puts focus on the location (in my bag), often implying contrast (not somewhere else).