user92719: Block size is still limited to 1MB. As I understood, transaction size is no longer limited. So can I be sure that my transaction with 29000 outputs and reliable fee will be included into block?
Or what is the max transaction size?

user38618: 
Can I send almost 1MB transaction?

To be able to send a transaction that a miner will accept, that transaction has to be a standard transaction. As defined in policy.h
/** The maximum weight for transactions we're willing to relay/mine */
static const unsigned int MAX_STANDARD_TX_WEIGHT = 400000;

For non-Segwit transactions, the limit is 400,000 KB / 4 = 100,000 B = 100 kB.
Therefore, if you have a Pre-Segwit transaction larger than 100 kB but smaller than the block s̶i̶z̶e weight limit, you should contact a miner, and they'll be able to add your transaction to their block manually, if it's profitable for them.

92719: <p>Block size is still limited to 1MB. As I understood, transaction size is no longer limited. So can I be sure that my transaction with 29000 outputs and reliable fee will be included into block?
Or what is the max transaction size?</p>
 38618: <blockquote>
  <p>Can I send almost 1MB transaction?</p>
</blockquote>

<p>To be able to send a transaction that a miner will accept, that transaction has to be a standard transaction. As defined in <a href="https://github.com/bitcoin/bitcoin/blob/eb7daf4/src/policy/policy.h#L24" rel="noreferrer"><code>policy.h</code></a></p>

<pre><code>/** The maximum weight for transactions we're willing to relay/mine */
static const unsigned int MAX_STANDARD_TX_WEIGHT = 400000;
</code></pre>

<p>For non-Segwit transactions, the limit is <code>400,000 KB / 4 = 100,000 B = 100 kB</code>.</p>

<p>Therefore, if you have a Pre-Segwit transaction larger than 100 kB but smaller than the block s̶i̶z̶e weight limit, you should contact a miner, and they'll be able to add your transaction to their block manually, if it's profitable for them.</p>
